John 3:8

8. The wind In primitive times the air is the most natural symbol of spirit. It is the breath of God. And so in Latin, Greek, and Hebrew the word for spirit is the same as the word for breath. But, specially, like spirit, we know that the air is, though our senses may not behold it. It tells the simplest barbarian that there may be existence which is beyond the reach of his perceptions. At the present day we might take electricity, or magnetism, or oxygen, to show how the mightiest agencies are beyond the reach of our senses.

Bloweth where it listeth Where it pleases or wills. By a beautiful touch the volitional power, that is, the will, belonging to spirit, is here attributed to the wind. The Divine Spirit acts by its own supreme, and supremely wise, will. Yet, as modern science has discovered in some degree the laws of winds and storms, it is demonstrated that the wind, however capricious it may seem, is as truly under law as the solar system. And so the Spirit is not capricious a powerful and arbitrary sovereign but acts freely in accordance not with fixed laws, but with wise and wisely adapted principles and reasons.

Thou hearest the sound Its substance is beyond the reach of our senses; it presses upon us by its weight, unfelt. If it were always perfectly still, men would be insensible of its existence. It discovers its insensible existence by its effects. So marvel not that there is an unseen Spirit, whose substance is unseen, whose weight is unfelt, whose existence can be known to mortal sense only by its effects. It has indeed its own rules and reasons of action; but these rules are to us unknown.

Every one… born of the Spirit He experiences the effects of a power which sense cannot reach. He cannot tell how, or why, or whence it acts.