"And the Lord visited Sarah, as he had said, and the Lord did unto Sarah as he had spoken." Here we have accomplished promise,--the blessed fruit of patient waiting upon God. None ever waited in vain. The soul that takes hold of God's promise by faith has gotten a stable reality which will never fail him. Thus was it with Abraham; thus was it with all the faithful from age to age; and thus will it be with all those who are enabled, in any measure, to trust in the living God. Oh, it is a wonderful blessing to have God himself as our portion and resting-place, amid the unsatisfying shadows of this scene through which we are passing; to have our anchor cast within the veil; to have the word and oath of God, the two immutable things, to lean upon, for the comfort and tranquillity of our souls.
When God's promise stood before the soul of Abraham, as an accomplished fact, he might well have learnt the futility of his own effort to reach that accomplishment. Ishmael was of no use whatever, so far as God's promise was concerned. He might, and did, afford something for nature's affections to entwine themselves around, thus furnishing a more difficult task for Abraham to perform afterwards; but he was in no wise conducive to the development of the purpose of God, or to the establishment of Abraham's faith,--quite the reverse. Nature can never do aught for God. The Lord must "visit," and the Lord must "do," and faith must wait, and nature must be still; yea, must be entirely set aside as a dead, worthless thing, and then the divine glory can shine out, and faith find in that outshining all its rich and sweet reward. "Sarah conceived and bare Abraham a son in his old age, _at the set time_ of which God had spoken to him." There is such a thing as God's "set time," his "due season," and for this the faithful must be content to wait. The time may seem long, and hope deferred may make the heart sick; but the spiritual mind will ever find its relief in the assurance that all is for the ultimate display of God's glory. "For the vision is for an appointed time, but _at the end_ it shall speak, and not lie; though it tarry, wait for it; because it will surely come, it will not tarry ... but the just shall live by his faith." (Hab. ii. 3, 4.) This wondrous faith! It brings into our present all the power of God's future, and feeds upon God's promise as a present reality. By its power the soul is kept hanging upon God, when every outward thing seems to be against it; and, "at the set time," the mouth is filled with laughter. "Abraham was an hundred years old when his son Isaac was born unto him." Thus nature had nothing to glory in. "Man's extremity was God's opportunity;" and Sarah said, "_God_ hath made me to laugh." All is triumph when God is allowed to show himself.
Now, while the birth of Isaac filled Sarah's mouth with laughter, it introduced an entirely new element into Abraham's house. The son of the free-woman very speedily developed the true character of the son of the bond-woman. Indeed, Isaac proved in principle to be to the household of Abraham what the implantation of the new nature is in the soul of a sinner. It was not _Ishmael changed_, but it was _Isaac born_. The son of the bond-woman could never be any thing else but that. He might become a great nation; he might dwell in the wilderness and become an archer; he might become the father of twelve princes;--but he was the son of the bond-woman all the while. On the contrary, no matter how weak and despised Isaac might be, he was the son of the free-woman. His position and character, his standing and prospects, were all from the Lord. "That which is born of the flesh is flesh; and that which is born of the Spirit is spirit."
Regeneration is not a change of the old nature, but the introduction of a new: it is the implantation of the nature or life of the second Adam, by the operation of the Holy Ghost, founded upon the accomplished redemption of Christ, and in full keeping with the sovereign will or counsel of God. The moment a sinner believes in his heart and confesses with his mouth the Lord Jesus, he becomes the possessor of a new life, and that life is Christ. He is born of God, is a child of God, is a son of the free-woman. (See Rom. x. 9; Col. iii. 4; 1 John iii. 1, 2; Gal. iii. 26; iv. 31.)
Nor does the introduction of this new nature alter, in the slightest degree, the true, essential character of the old. This latter continues what it was, and is made in no respect better; yea, rather, there is the full display of its evil character in opposition to the new element. "The flesh lusteth against the Spirit, and the Spirit against the flesh; and these are contrary the one to the other." There they are in all their distinctness, and the one is only thrown into relief by the other.