Yes, it's a wise saying even thought it's fake Latin. A motto especially apt for a high school teacher to live by.
There's a whole bunch of not quite real Latin proverbs I remember, some "almost" the real thing... like, Lingua Latina non est penis canina. And a friend, a med student at the time, once commented in all seriousness when we were planning a picnic in the woods and it started raining, Per aspera ad anus. This one has since become my favorite expression for when things one carefully plans and looks forward to go bust for whatever reason. It's exactly the same idea which Shakespeare expressed in his characteristic, much more flowery way:
And enterprises of great pitch and moment
With this regard their currents turn awry
And lose the name of action.