How.

John 3:3
Jesus replied, "Truly, truly, I tell you, no one can see the kingdom of God unless he is born again."

John 4:11, 12
"Sir, " the woman replied, "You have nothing to draw with and the well is deep. Where then will You get this living water? . . .

John 6:53, 60
So Jesus said to them, "Truly, truly, I tell you, unless you eat the flesh and drink the blood of the Son of Man, you have no life in you. . . .

1 Corinthians 1:18
For the message of the cross is foolishness to those who are perishing, but to us who are being saved it is the power of God.

1 Corinthians 2:14
The natural man does not accept the things that come from the Spirit of God. For they are foolishness to him, and he cannot understand them, because they are spiritually discerned.