"...unless one is born again he cannot see...[or] enter the kingdom of God....The wind blows where it wishes, and you hear its sound, but you do not know where it comes from or where it goes. So it is with everyone who is born of the Spirit.” John 3:3,5,8
Jesus declared that unless a person is born again – unless he is regenerated, quickened or granted new life by the Spirit of God – he cannot "see" or "enter" the kingdom of God. The word "see" refers not to the perception of physical eyes, but to perception of the heart about spiritual things. That is, unless a person is supernaturally changed by God, he cannot have a heart which understands, or ears to hear or eyes to see the things of God (Deut 29:4; 30:6). Due to his unspiritual nature and corrupted condition it is utterly beyond his human powers to understand the truth about Christ or believe His revelation. The word "enter" refers to participation in kingdom life. That is, unless a man is born from above, he cannot be adopted into God's family. A citizen of God's kingdom must be born into it.