The wind blows where it wishes. You hear its sound, but you do not know where it comes from or where it is going. So it is with everyone born of the Spirit.”
The wind has no will strictly speaking, but moves freely and variably, now this way, now that. Christ means the Spirit's work in man's renewal is just as perceptible as air's motion in the world, yet its manner remains hidden. We are ungrateful and malicious if we do not adore God's power in spiritual rebirth when we see so striking a display of it in mere bodily life.
AI summary
Nicodemus hears the explanation of being born of water and Spirit, sees the wind likened to it, and still cannot fathom it. The mystery remains impossible to him, he cannot accept that a man should be born again, no matter how clearly Christ illustrates it. His mind is locked against the truth.
AI summary
You object that you do not understand how it can be, but you believe harder things daily. The wind itself you never see, yet you trust its effects: trees move, waters rise, you feel the breeze. So with the Spirit: see sinners become holy, the vicious moral, the rebellious meek. Judge by the effects, not by your comprehension of the mechanism.
AI summary