I would like to ask the connotation of "both wisdom and courage", and it would be better to analyze it thoroughly.

This statement is actually dialectical thinking. People with profound wisdom often can't tolerate it, because after all, they have superior IQ and few opponents, so they will have no patience and don't know how to endure and avoid others' doubts and provocations, which has become his weakness and weakness. Being brave and good at fighting is an essential personal ability of a general, but it would be icing on the cake if he can be good at using strategy. Going up a storey still higher is a rare and scarce talent.