1Jo 5:16 describes different severities of sin. Heb 3:12,13 describe a Christians need to combat their sinful tendancy. Heb 10:26,27 describe those who reject Jesus. 1 Jo 3:19 gives us confidence if we feel bad and work hard not to practice sin. Matt 12:31 and Mark 3:28,29 describes those who are beyond forgiveness. Heb 6:4-6 describes the condition of those who commit an unforgivable sin. @Faith Mendel, Additional thoughts: Your question had these additional clarifications. each is addressed below.
".... what is the eternal consequence of habitual sin....? Rev 7:9 describes ones in white robes standing before the throne, vs 14 says they have washed their robes in the blood of the Lamb resulting in everlasting life. All disirous of eternal life must work hard to avoid a practice of willfully choosing to sin. Because Jas 1:14,15 unrestrained willfil sin leads to death. Matt 10:22 shows that we must maintain our Christian identification till the end of our life or until Gods Judgment comes.
The next 2 q are similar.
Does he merely receive temporal punishment but yet will be admitted into the kingdom? Or does the believer lose his admission into the kingdom by persistence in habitual sins?
Repentance is required for forgiveness. Rev 1:5, Lu 13:3-9 Mark 6:12, Acts 2:38, 3:19. Exerpt from Insight on the Scriptures: "In Greek, two verbs are used in connection with repentance: me·ta·no·eʹo and me·ta·meʹlo·mai. The first is composed of me·taʹ, meaning “after,” and no·eʹo (related to nous, the mind, disposition, or moral consciousness), meaning “perceive, discern, mentally grasp, or be aware.” Hence, me·ta·no·eʹo literally means afterknowing (in contrast to foreknowing) and signifies a change in one’s mind, attitude, or purpose. Me·ta·meʹlo·mai, on the other hand, comes from meʹlo, meaning “care for or have interest in.” The prefix me·taʹ (after) gives the verb the sense of ‘regretting’ (Mt 21:29; 2Co 7:8), or ‘repenting.’" Those who continually choose to act on their sinful nature, "works of the flesh" Gal 5:19-21 are in line for losing out on their opportunity for everlasting life as shown also from Heb 3:12-14, Those with faith in Christ must maintain "clean garments" identifying themselves by their fine conduct to be in line for future blessings Gal 5:22-26. At some point some may be so flagrent in their sinful conduct as to render themselves beyond forgiveness. Heb 10:26-31 Matt 12:31 Mark 3:28,29. It is not up to us as sinful humans to Judge another as to whether he has committed an "unforgivable sin" or not. God has put all Judgment into the hands of Jesus. 1 Tim 4:1 If we fear we may be unforgivable, NOTE: I ASSUME, that if we had, we would not be disirous of returning to God as in the case of Judas Lu 6:16, Jo 6:70,71 (greek diablos meaning devil or slanderer) The course that Judas chose was a deliberate one, involving malice, greed, pride, hypocrisy, and scheming. He afterward felt remorse under the burden of guilt, as a willful murderer might at the result of his crime. Yet Judas had of his own volition made a bargain with those who Jesus said made proselytes that were subjects of Gehenna twice as much as themselves, who were also liable to “the judgment of Gehenna.” (Mt 23:15, 33) So in this state he committed suicide. This is not denoting that all suicide is unforgivable, but that in Judas mind he knew he had lost any chance of Gods mercy, he was beyond repentance. Thus we may see examples of those who are unforgivable but it is not our place to discover these but instead it is the Christian obligation to continue to assist others to Build their own Faith in Christ our Judge as commanded in 2 Tim 4:1-5, to try to help them to repentance. If they are not repentant, their bad influence must be removed as in 1Cor 5:1,2,9-13. This provision is not necessarily a recognition that they are beyond Gods forgiveness, but given as a protection against bad influence from within the trusted fellowship.
There is much more to consider on this subject, such as what about those who die before "Judgment Day" are not their sins paid for? What about those who die before the Messiah came?, siffice it to say simply, No imperfect human knows for sure Gods judgment on another unless revealed in Scripture. The consequence of habitual sinning will most likely lead to a Christians failure to "endure firm to the end" resulting in losing out on their prospect for eternal life.

1Jo 5:16 describes different severities of sin. Heb 3:12,13 describe a Christian's need to combat their sinful tendency. Heb 10:26,27 describe those who reject Jesus. 1 Jo 3:19 gives us confidence if we feel bad and work hard not to practice sin. Matt 12:31 and Mark 3:28,29 describes those who are beyond forgiveness. Heb 6:4-6 describes the condition of those who commit an unforgivable sin. @Faith Mendel, Additional thoughts: Your question had these additional clarifications. each is addressed below.

".... what is the eternal consequence of habitual sin....? Rev 7:9 describes ones in white robes standing before the throne, vs 14 says they have washed their robes in the blood of the Lamb resulting in everlasting life. All desirous of eternal life must work hard to avoid the practice of willfully choosing to sin. Because Jas 1:14,15 unrestrained willful sin leads to death. Matt 10:22 shows that we must maintain our Christian identification till the end of our life or until God's Judgment comes.

The next two questions are similar.
Does he merely receive temporal punishment but yet will be admitted into the kingdom? Or does the believer lose his admission into the kingdom by persistence in habitual sins?

Repentance is required for forgiveness. Rev 1:5, Lu 13:3-9 Mark 6:12, Acts 2:38, 3:19. Excerpt from Insight on the Scriptures:

In Greek, two verbs are used in connection with repentance: me·ta·no·eʹo and me·ta·meʹlo·mai. The first is composed of me·taʹ, meaning “after,” and no·eʹo (related to nous, the mind, disposition, or moral consciousness), meaning “perceive, discern, mentally grasp, or be aware.” Hence, me·ta·no·eʹo literally means afterknowing (in contrast to foreknowing) and signifies a change in one’s mind, attitude, or purpose. Me·ta·meʹlo·mai, on the other hand, comes from meʹlo, meaning “care for or have interest in.” The prefix me·taʹ (after) gives the verb the sense of ‘regretting’ (Mt 21:29; 2Co 7:8), or ‘repenting.’

Those who continually choose to act on their sinful nature, "works of the flesh" Gal 5:19-21 are in line for losing out on their opportunity for everlasting life as shown also from Heb 3:12-14, Those with faith in Christ must maintain "clean garments" identifying themselves by their fine conduct to be in line for future blessings Gal 5:22-26. At some point, some may be so flagrant in their sinful conduct as to render themselves beyond forgiveness. Heb 10:26-31 Matt 12:31 Mark 3:28,29. It is not up to us as sinful humans to Judge another as to whether he has committed an "unforgivable sin" or not. God has put all Judgment into the hands of Jesus. 1 Tim 4:1 If we fear we may be unforgivable. Note: I assume, that if we had, we would not be desirous of returning to God as in the case of Judas Lu 6:16, Jo 6:70,71 (Greek diablos meaning devil or slanderer) the course that Judas chose was a deliberate one, involving malice, greed, pride, hypocrisy, and scheming. He afterward felt remorse under the burden of guilt, as a willful murderer might at the result of his crime. Yet Judas had of his own volition made a bargain with those who Jesus said made proselytes that were subjects of Gehenna twice as much as themselves, who were also liable to “the judgment of Gehenna.” (Mt 23:15, 33) So in this state, he committed suicide. This is not denoting that all suicide is unforgivable, but that in Judas' mind, he knew he had lost any chance of God's mercy, he was beyond repentance. 

Thus we may see examples of those who are unforgivable but it is not our place to discover these instead it is the Christian obligation to continue to assist others to build their own Faith in Christ our Judge as commanded in 2 Tim 4:1-5, to try to help them to repentance. If they are not repentant, their bad influence must be removed as in 1 Cor 5:1,2,9-13. This provision is not necessarily a recognition that they are beyond God's forgiveness but given as a protection against bad influence from within the trusted fellowship.

There is much more to consider on this subject, such as what about those who die before "Judgment Day" are not their sins paid for? What about those who die before the Messiah came?, suffice it to say simply, No imperfect human knows for sure God's judgment on another unless revealed in Scripture. The consequence of habitual sinning will most likely lead to a Christian's failure to "endure firm to the end" resulting in losing out on their prospect for eternal life.

1Jo 5:16 describes different severities of sin. Heb 3:12,13 describe a Christians need to combat their sinful tendancy. Heb 10:26,27 describe those who reject Jesus. 1 Jo 3:19 gives us confidence if we feel bad and work hard not to practice sin. Matt 12:31 and Mark 3:28,29 describes those who are beyond forgiveness. Heb 6:4-6 describes the condition of those who commit an unforgivable sin.

1Jo 5:16 describes different severities of sin. Heb 3:12,13 describe a Christians need to combat their sinful tendancy. Heb 10:26,27 describe those who reject Jesus. 1 Jo 3:19 gives us confidence if we feel bad and work hard not to practice sin. Matt 12:31 and Mark 3:28,29 describes those who are beyond forgiveness. Heb 6:4-6 describes the condition of those who commit an unforgivable sin. @Faith Mendel, Additional thoughts: Your question had these additional clarifications. each is addressed below.
".... what is the eternal consequence of habitual sin....? Rev 7:9 describes ones in white robes standing before the throne, vs 14 says they have washed their robes in the blood of the Lamb resulting in everlasting life. All disirous of eternal life must work hard to avoid a practice of willfully choosing to sin. Because Jas 1:14,15 unrestrained willfil sin leads to death. Matt 10:22 shows that we must maintain our Christian identification till the end of our life or until Gods Judgment comes.
The next 2 q are similar.
Does he merely receive temporal punishment but yet will be admitted into the kingdom? Or does the believer lose his admission into the kingdom by persistence in habitual sins?
Repentance is required for forgiveness. Rev 1:5, Lu 13:3-9 Mark 6:12, Acts 2:38, 3:19. Exerpt from Insight on the Scriptures: "In Greek, two verbs are used in connection with repentance: me·ta·no·eʹo and me·ta·meʹlo·mai. The first is composed of me·taʹ, meaning “after,” and no·eʹo (related to nous, the mind, disposition, or moral consciousness), meaning “perceive, discern, mentally grasp, or be aware.” Hence, me·ta·no·eʹo literally means afterknowing (in contrast to foreknowing) and signifies a change in one’s mind, attitude, or purpose. Me·ta·meʹlo·mai, on the other hand, comes from meʹlo, meaning “care for or have interest in.” The prefix me·taʹ (after) gives the verb the sense of ‘regretting’ (Mt 21:29; 2Co 7:8), or ‘repenting.’" Those who continually choose to act on their sinful nature, "works of the flesh" Gal 5:19-21 are in line for losing out on their opportunity for everlasting life as shown also from Heb 3:12-14, Those with faith in Christ must maintain "clean garments" identifying themselves by their fine conduct to be in line for future blessings Gal 5:22-26. At some point some may be so flagrent in their sinful conduct as to render themselves beyond forgiveness. Heb 10:26-31 Matt 12:31 Mark 3:28,29. It is not up to us as sinful humans to Judge another as to whether he has committed an "unforgivable sin" or not. God has put all Judgment into the hands of Jesus. 1 Tim 4:1 If we fear we may be unforgivable, NOTE: I ASSUME, that if we had, we would not be disirous of returning to God as in the case of Judas Lu 6:16, Jo 6:70,71 (greek diablos meaning devil or slanderer) The course that Judas chose was a deliberate one, involving malice, greed, pride, hypocrisy, and scheming. He afterward felt remorse under the burden of guilt, as a willful murderer might at the result of his crime. Yet Judas had of his own volition made a bargain with those who Jesus said made proselytes that were subjects of Gehenna twice as much as themselves, who were also liable to “the judgment of Gehenna.” (Mt 23:15, 33) So in this state he committed suicide. This is not denoting that all suicide is unforgivable, but that in Judas mind he knew he had lost any chance of Gods mercy, he was beyond repentance. Thus we may see examples of those who are unforgivable but it is not our place to discover these but instead it is the Christian obligation to continue to assist others to Build their own Faith in Christ our Judge as commanded in 2 Tim 4:1-5, to try to help them to repentance. If they are not repentant, their bad influence must be removed as in 1Cor 5:1,2,9-13. This provision is not necessarily a recognition that they are beyond Gods forgiveness, but given as a protection against bad influence from within the trusted fellowship.
There is much more to consider on this subject, such as what about those who die before "Judgment Day" are not their sins paid for? What about those who die before the Messiah came?, siffice it to say simply, No imperfect human knows for sure Gods judgment on another unless revealed in Scripture. The consequence of habitual sinning will most likely lead to a Christians failure to "endure firm to the end" resulting in losing out on their prospect for eternal life.