What is the meaning of Luke 3:8?
"We have Abraham as our father", the Jews obviously considered their ancestry of Abraham to give them merit with God. John found it necessary to say to them otherwise.:
In Luke 3:8, we can read:
Produce fruit in keeping with repentance. And do not begin to say to yourselves, ‘We have Abraham as our father.’ For I tell you that out of these stones God can raise up children for Abraham. (NIV)
Also, Jesus found it necessary to tell the Jews that their ancestry was no advantage to them in gaining merit with God, unless they repented and harmonized their lives with God's laws and commandments. Jesus said to them:
Luke 13:24-30 NASB
24 “Strive to enter through the narrow door; for many, I tell you, will seek to enter and will not be able. 25 Once the head of the house gets up and shuts the door, and you begin standing outside and knocking on the door, saying, ‘Lord, open up to us!’ and He then will answer and say to you, ‘I do not know where you are from.’ 26 Then you will begin saying, ‘We ate and drank in Your presence, and You taught in our streets!’ 27 And yet He will [a]say, ‘I do not know where you are from; leave Me, all you [b]evildoers.’ 28 In that place there will be weeping and gnashing of teeth when you see Abraham, Isaac, Jacob, and all the prophets in the kingdom of God, but yourselves being thrown out. 29 And they will come from east and west, and from north and south, and will recline at the table in the kingdom of God. 30 And behold, some are last who will be first, and some are first who will be last.”
The Jewish people were the first to be invested with such blessings, for entry into the kingdom of God. Their fleshly ancestry of Abraham was not, however, sufficient for them to inherit the kingdom of God unless they made efforts to meet God's requirements. Only a remnant accepted the invitation and so God turned his attention to filling the places required before the door shuts to the Gentiles-Nations east and west so to speak. Cornelius was the first such person, not being a Jew or a Jewish proselyte., the door is still open for those still willing to accept the invitation and exert themselves entry into the kingdom. [Read "The wedding feast " [Matthew 22:1-14, Rev. 2:26-27, 7:9-10]