Exodus 18:17 - Ellicott's Commentary On The Whole Bible

The thing that thou doest is not good. — Weighty as the arguments were, they failed to convince Jethro. He brought forward counter-arguments. By continuing to act as hitherto, Moses would, in the first place, exhaust his own strength, and, secondly exhaust the patience of the people. His practice was un advisable, both on his own account and on theirs. To keep suitors waiting all day, and perhaps finally dismiss then without their turn having come, was not fair upon them.