Jesus answered him, "Most assuredly, I tell you, unless one is born anew,{The word translated "anew" here and in John 3:7 (anothen) also means "again" and "from above".} he can't see the Kingdom of God."
To SEEthe kingdom of God is of the same meaning as to enter into the kingdom of God, as we shall immediately perceive from the context. But they are mistaken who suppose that the kingdom of God means Heaven; for it rather means the spiritual life, which is begun by faith in this world, and gradually increases every day according to the continued progress of faith. So the meaning is, that no man can be truly united to the Church, so as to be reckoned among the children of God, until he has been previously renewed. This expression shows briefly what is the beginning of Christianity, and at the same time teaches us, that we are born exiles and utterly alienated from the kingdom of God, and that there is a perpetual state of variance between God and us, until he makes us altogether different by our being born again; for the statement is general, and comprehends the whole human race. If Christ had said to one person, or to a few individuals, that they could not enter into heaven, unless they had been previously born again, we might have supposed that it was only certain characters that were pointed out, but he speaks of all without exception; for the language is unlimited, and is of the same import with such universal terms as these: Whosoever shall not be born again cannot enter into the kingdom of God 