君子之学，非为通也，为穷而不困，忧而意不衰也，知祸福终始而心不惑也。· For a gentleman，the aim of learning is not the rapid advance in his career，he studies so that he will feel no difficulty in adversity，he will feel no frustration when worried，and his mind will not be confused because he knows the beginning and end of fortune and misfortune.