This, “it was said by them of old time,” shews that it was long ago that they had received this precept. He says this that He might rouse His sluggish hearers to proceed to more sublime precepts, as a teacher might say to an indolent boy, Know you not how long time you have spent already in merely learning to spell? In that, “I say unto you,” mark the authority of the legislator, none of the old Prophets spoke thus; but rather, “Thus saith the Lord.” They as servants repeated the commands of their Lord; He as a Son declared the will of His Father, which was also His own. They preached to their fellow servants; He as master ordained a law for his slaves.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).