John 4:10; Hebrews 6:4

10 Jesus answered her, If you knew the gift of God, and who it is that is saying to you, Give me a drink, you would have asked him, and he would have given you hliving water.

For it is impossible, in the case of those qwho have once been enlightened, who have tasted rthe heavenly gift, and shave shared in the Holy Spirit,