Reporting on the conversation between the Son of God and Nicodemus, the apostle John wrote: “Nicodemus said to him: ‘How can a man be born when he is old? He cannot enter into the womb of his mother a second time and be born, can he?’ Jesus answered: ‘Most truly I say to you, Unless anyone is born from water and spirit, he cannot enter into the kingdom of God. What has been born from flesh is flesh, and what has been born from the spirit is spirit. Do not marvel because I told you, You people must be born again. The wind blows where it wants to, and you hear the sound of it, but you do not know where it comes from and where it is going. So is everyone that has been born from the spirit.’”​—John 3:4-8.

As Jesus told Nicodemus, persons “born from the spirit” are like the wind. In what way? This is because the original Source of their spirit-begettal is Jehovah God. This cannot be discerned by humans generally, any more than they can see the blowing wind. They may hear the sound of the wind and can observe its effects. Similarly, they may note the effects that God’s spirit is having on those who are “born again.” But they cannot fully appreciate the cause of these effects nor do they comprehend the heavenly destination toward which spirit-begotten persons are moving.