Ephesians 4:25-32 gives a list of practical recommendations on how Christians should conduct themselves so as to avoid grieving the Holy Spirit.
25 Therefore, ridding yourselves of falsehood, speak truth each one of you with his neighbor, because we are parts of one another. 26 Be angry, and yet do not sin; do not let the sun go down on your anger, 27 and do not give the devil an opportunity. 28 The one who steals must no longer steal; but rather he must labor, producing with his own hands what is good, so that he will have something to share with the one who has need. 29 Let no unwholesome word come out of your mouth, but if there is any good word for edification according to the need of the moment, say that, so that it will give grace to those who hear. 30 Do not grieve the Holy Spirit of God, by whom you were sealed for the day of redemption. 31 All bitterness, wrath, anger, clamor, and slander must be removed from you, along with all malice. 32 Be kind to one another, compassionate, forgiving each other, just as God in Christ also has forgiven you. [Ephesians 4:25-32 NASB]
Now, I was pondering on the verse in bold and thought: how does Paul know that the Holy Spirit is grieved when Christians fall into sins such as the ones listed in the passage above? Is Paul saying this from an intellectual/theoretical understanding of how the Holy Spirit is supposed to feel when we sin? Or is Paul saying this from first-hand experiential knowledge? In other words, when the Holy Spirit is grieved because of sin, does the Christian get to share in the grief? Does the Christian feel inside the weight of the sin and the grief he/she has inflicted upon the Spirit? Or does the Spirit suffer the grief in the background, with the Christian unawares, and that's why Paul has to explicitly teach us this valuable piece of information so that we become intellectually aware (rather than experientially aware)?