Don't be concerned about others not appreciating you. Be concerned about your not appreciating others.
The man who asks a question is a fool for a minute, the man who does not ask is a fool for life.
A gentleman is calm and spacious: the vulgar are always fretting.
Ignorance is the night of the mind, but a night without moon or star.
The man who loves his job never works a day in his life.
To know that one knows what one knows, and to know that one doesn't know what one doesn't know, there lies true wisdom.