Genesis 17:23

23.And Abraham took Ishmael Moses now commends the obedience of Abraham because he circumcised the whole of his family as he had been commanded. For he must, of necessity, have been entirely devoted to God, since he did not hesitate to inflict upon himself a wound attended with acute pain, and not without danger of life. To this may be added the circumstance of the time; namely, that he does not defer the work to another day, but immediately obeys the Divine mandate. There is, however, no doubt, that he had to contend with various perplexing thoughts. Not to mention innumerable others, this might come into his mind, ‘As for me, who have been so long harassed with many adverse affairs, and tossed about in different exiles, and yet have never swerved from the word of God; if, by this symbol, he would consecrate me to himself as a servant, why has he put me off to extreme old age? What does this mean, that I cannot be saved unless I, with one foot almost in the grave, thus mutilate myself?’ But this was an illustrious proof of obedience, that having overcome all difficulties, he quickly, and without delay, followed where God called him. And he gave, in so doing, an example of faith not less excellent; because, unless he had certainly embraced the promises of God, he would by no means have become so prompt to obey. Hence, therefore, arose his great alacrity, because he set the word of God in opposition to the various temptations which might disturb his mind, and draw him in contrary directions.

Two things also here are worthy of observation. First, that Abraham was not deterred by the difficulty of the work from yielding to God the duty which he owed him. We know that he had a great multitude in his house, nearly equal to a people. It was scarcely credible that so many men would have suffered themselves to be wounded apparently to be made a laughingstock. Therefore it was justly to be feared, that he would excite a great tumult in his tranquil family; yea, that, by a common impulses the major part of his servants would rise up against him; nevertheless, relying upon the word of God, he strenuously attempts what seemed impossible.

We next see, how faithfully his family was instructed; because not only his home-born slaves, but foreigners, and men bought with money, meekly receive the wounds which was both troublesome, and the occasion of shame to carnal sense. It appears then that Abraham diligently took care to have them prepared for due obedience. And since he held them under holy discipline, he received the reward of his own diligences in finding them so tractable in a most arduous affair. So, at this day, God seems to enjoin a thing impossible to be done, when he requires his gospel to be preached every where in the whole world, for the purpose of restoring it from death to life. For we see how great is the obstinacy of nearly all men, and what numerous and powerful methods of resistance Satan employs; so that, in short, all the ways of access to these principles are obstructed. Yet it behoves individuals to do their duty, and not to yield to impediments; and, finally our endeavors and our labors shall by no means fail of that success which is not yet apparent.