No one has ascended into heaven, but he who descended out of heaven, the Son of Man, who is in heaven.
[c.] The necessity of this change. First, Christ here shows that it is necessary in the nature of the thing, for we are not fit to enter into the kingdom of God till we are born again: That which is born of the flesh if flesh, John 3:6. Here is our malady, with the causes of it, which are such that it is plain there is no remedy but we must be born again. 1. We are here told what we are: We are flesh, not only corporeal but corrupt, Genesis 6:3. The soul is still a spiritual substance, but so wedded to the flesh, so captivated by the will of the flesh, so in love with the delights of the flesh, so employed in making provision for the flesh, that it is mostly called flesh; it is carnal. And what communion can there be between God, who is a spirit, and a soul in this condition? 2. How we came to be so; by being born of the flesh. It is a corruption that is bred in the bone with us, and therefore we cannot have a new nature, but we must be born again. The corrupt nature, which is flesh, takes rise from our first birth; and therefore the new nature, which is spirit, must take rise from a second birth. Nicodemus spoke of entering again into his mother's womb, and being born; but, if he could do so, to what purpose? If he were born of his mother a hundred times, that would not mend the matter, for still that which is born of the flesh if flesh; a clean thing cannot be brought out of an unclean. He must seek for another original, must be born of the Spirit, or he cannot become spiritual. The case is, in short, this: though man is made to consist of body and soul, yet his spiritual part had then so much the dominion over his corporeal part that he was denominated a living soul (Genesis 2:7), but by indulging the appetite of the flesh, in eating forbidden fruit, he prostituted the just dominion of the soul to the tyranny of sensual lust, and became no longer a living soul, but flesh: Dust thou art. The living soul became dead and inactive; thus in the day he sinned he surely died, and so he became earthly. In this degenerate state, he begat a son in his own likeness; he transmitted the human nature, which had been entirely deposited in his hands, thus corrupted and depraved; and in the same plight it is still propagated. Corruption and sin are woven into our nature; we are shapen in iniquity, which makes it necessary that the nature be changed. It is not enough to put on a new coat or a new face, but we must put on the new man, we must be new creatures. Secondly, Christ makes it further necessary, by his own word: Marvel not that I said unto thee, You must be born again, John 3:7. 1. Christ hath said it, and as he himself never did, nor ever will, unsay it, so all the world cannot gainsay it, that we must be born again. He who is the great Lawgiver, whose will is a law,—he who is the great Mediator of the new covenant, and has full power to settle the terms of our reconciliation to God and happiness in him,—he who is the great Physician of souls, knows their case, and what is necessary to their cure,—he hath said, You must be born again. "I said unto thee that which all are concerned in, You must, you all, one as well as another, you must be born again: not only the common people, but the rulers, the masters in Israel." 2. We are not to marvel at it; for when we consider the holiness of the God with whom we have to do, the great design of our redemption, the depravity of our nature, and the constitution of the happiness set before us, we shall not think it strange that so much stress is laid upon this as the one thing needful, that we must be born again.