Now there was a man of the Pharisees, named Nicodemus, a ruler of the Jews; this man came to Jesus by night and said to Him, “Rabbi, we know that You have come from God as a teacher; for no one can do these signs that You do unless God is with him.” Jesus answered and said to him, “Truly, truly, I say to you, unless one is born again he cannot see the kingdom of God.” Nicodemus said to Him, “How can a man be born when he is old? He cannot enter a second time into his mother’s womb and be born, can he?” Jesus answered, “Truly, truly, I say to you, unless one is born of water and the Spirit he cannot enter into the kingdom of God. “That which is born of the flesh is flesh, and that which is born of the Spirit is spirit. “Do not be amazed that I said to you, ‘You must be born again.’ “The wind blows where it wishes and you hear the sound of it, but do not know where it comes from and where it is going; so is everyone who is born of the Spirit.” (John 3:1-9)

“The change which our Lord here declares needful to salvation is evidently no slight or superficial one. It is not merely reformation, or amendment, or moral change, or outward alteration of life. It is a thorough change of heart, will, and character. It is a resurrection. It is a new creation. It is a passing from death to life. It is the implanting in our dead hearts of a new principle from above. It is the calling into existence of a new creature, with a new nature, new habits of life, new tastes, new desires, new appetites, new judgments, new opinions, new hopes, and new fears. All this, and nothing less than this is implied, when our Lord declares we all need a ‘new birth’. … Heaven may be reached without money, or rank, or learning. But it is clear as daylight, if words have any meaning, that nobody can enter heaven without a ‘new birth’.” (Expository Thoughts: John, vol. I, 86-87)