St. Matthew appears to give the more full account, of which St. Mark's is an abbreviation. If we suppose the scribes here to interpose their question, "Why then did Moses permit a bill of divorcement?"
t he two narratives fit exactly. Our Lord here answers their question, For your hardness of heart he wrote you this commandment. He permitted (not commanded) them to put away their wives, lest dislike might turn to hatred.
From the beginning God joined them in one indissoluble bend; but man's nature having become corrupt through sin, that sin changed and corrupted the institution, and so was the occasion of bills of divorcement, and polygamy.
The Law of Moses put some restraint upon the freedom with which men had till then put away their wives; for thenceforth, a divorce could not take place until some legal steps had been taken, and a regular instrument had been drawn up; and this delay might often be the means of preventing a divorce which might otherwise have been effected in a moment of passion.
Thus this legislation was adapted to the imperfect moral condition of the people, who were as yet quite unprepared for a higher moral code.