God is all-wise, and therefore takes no rash, precipitate steps. As the original plan of salvation was devised by infinite wisdom, so all the successive steps of the execution of that plan are directed by the same boundless wisdom also. "Wherein he hath abounded towards us," says Paul (Eph.1:8), "in all wisdom and prudence."
Thus, in his dealings with his people, God does not put them at once into possession of all the blessings which he has laid up for them. He has pardoned, for instance, their sins; but he does not immediately, when he calls them by his grace, put them into possession of this blessing. He has first to teach them their need of it. He has to prepare their heart for the right reception of it. It is no common gift, and he has to teach them how to value it. They are saved from wrath and eternal misery, from his dreadful displeasure and ever-burning indignation against sin. They have need to be shewn, and made deeply to feel, from what they are saved, as well as to what they are saved. And as the oak does not grow to its full stature in a day, but needs years of sunshine and storm, of beating winds and howling tempests, to give it strength and consistency, a deep and wide root, as well as a lofty and branching stem, so do God's children need months and years of trial and temptation, that they may push a deep root downwards, and shoot up healthy and vigorous upwards.
Thus, before the soul can know anything about salvation, it must learn deeply and experimentally the nature of sin, and of itself, as stained and polluted thereby. It is proud, and needs to be humbled; careless, and needs to be awakened; alive, and needs to be killed; full, and requires to be emptied; whole, and needs to be wounded; clothed, and requires to be stripped. It is, by nature, self-righteous and self-seeking; is buried deep in worldliness and carnality; is utterly blind and ignorant; is filled with presumption, arrogance, conceit, and enmity, and hates all that is heavenly and spiritual. Sin, in all its various forms, is its natural element. "The Ethiopian cannot change his skin, nor the leopard his spots."
To make man the direct contrary of what he originally is; to make him love God instead of hating him; fear, instead of mocking him; obey, instead of rebelling against him; and to tremble at his terrible majesty, instead of running upon the thick bosses of his buckler;—to do this mighty work, and to effect this wonderful change, requires the implantation of a new nature by the immediate hand of God himself.