All that the Father gives Me will come to me, and the ones who come to Me I will try by no means to cast out - John 6:37

I am not referring to all of you; I know those I have chosen -

Jn 13:18, 20 (NIV)

You did not choose Me, but I choose you - Jn 15:16

I chose you out of the world - Jn 15:18, 19

no one can come to Me unless the Father enables him -

Jn 6:65 (NIV); Jn 6:44

You are a chosen generation - 1 Peter 2:9

For many are called (invited), but few are chosen (free will to choose Him) - Matthew 20:16; 22:14

for the elects sake whom He chose - Mark 13:20

with Him will be His called, chosen and faithful followers - Revelation 17:14

WARNING

Do not harden your hearts - Hebrews 3:3-15; Psalm 95:8

I will harden his (Pharaoh) heart - Exodus 4:12; 7:3; 14:4, 17

Therefore He has mercy on whom He will, and whom He wills He hardens - Romans 9:18

lest they should understand with their hearts and turn so that I should heal them - Isaiah 6:9, 10; Mt 13:15; Acts 28:27

Does not the potter have power over the clay, from the same lump to make one vessel for honor and another dishonor?  Romans 9:21