Comment by epo

A splendidly heroic way to miss the point. Someone who doesn't complain isn't actively trying not to complain, they are content with their lot. Thus, forcing yourself yourself not to complain is as silly an ambition as declaring "I will not think of elephants".

Complaints stem from discontent and/or powerlessness.

It is important that Jiro is largely in control of his own destiny, however small that might be. Most teachers are not really in control of anything significant at their workplace, cetrainly not their destiny. Most students don't yet have a destiny, they are forced to attend and are purely reactive.

Choose the right thing to do, be content doing that.