It must have pained Sarai to no end that she had given her slave girl to Abraham, and that her slave had given birth to a son. Sarai had thought she might have a son by the labors of her servant. She reasoned that if servants were for their master’s use, Hagar’s labor to bear a son would make that son hers, and by this, God’s promise would be realized. But this was not so. Sarai could not give Abraham a son of promise by the works of her slave girl. Neither the law, the works of man, nor the will of man can produce children to God. All who teach and preach and practice salvation by the will or work of man, whether in the beginning of it or in the middle or in the end, are slaves that can produce no fruit to God. God’s promises are not fulfilled by man's contribution, but by God's grace alone (Gal. 4:21-31). God’s work alone accomplish His promises.
Pastor Rick Warta