“Happiness depends upon ourselves.”

“...happiness does not consist in amusement. In fact, it would be strange if our end were amusement, and if we were to labor and suffer hardships all our life long merely to amuse ourselves.... The happy life is regarded as a life in conformity with virtue. It is a life which involves effort and is not spent in amusement....”

“All who have meditated on the art of governing mankind have been convinced that the fate of empires depends on the education of youth.”

“Happiness is a state of activity.”

“Happiness belongs to the self-sufficient.”

“One swallow does not make a summer, neither does one fine day; similarly one day or brief time of happiness does not make a person entirely happy.”

“The cultivation of the intellect is man's highest good and purest happiness”