To know, is to know that you know nothing. That is the meaning of true knowledge. When you say something, say what you know. When you don't know something, say you don't know. That is knowledge.
Instead of being concerned that you have no office, be concerned to think how you may fit yourself for office. Instead of being concerned that you are not known, seek to be worthy of being known.
Wealth and rank are what men desire, but unless they be obtained in the right way they may not be possessed. Poverty and obscurity are what men detest; but unless prosperity be brought about in the right way, they are not to be abandoned.
The failure to cultivate virtue, the failure to examine and analyze what I have learned, the inability to move toward righteousness after being shown the way, the inability to correct my faults-these are the causes of my grief.