Aristotle

“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.”

“Happiness is a state of activity.”

“The void is 'not-being,' and no part of 'what is' is a 'not-being,'; for what 'is' in the strict sense of the term is an absolute plenum. This plenum, however, is not 'one': on the contrary, it is a 'many' infinite in number and invisible owing to the minuteness of their bulk.”

“Time crumbles things; everything grows old under the power of Time and is forgotten through the lapse of Time.”

“Happiness is the meaning and the purpose of life, the whole aim and end of human existence.”

“The high-minded man must care more for the truth than for what people think.”

“Happiness depends upon ourselves.”

“Happiness is a quality of the soul...not a function of one's material circumstances.”

“Poetry is finer and more philosophical than history; for poetry expresses the universal, and history only the particular.”

“With the truth, all given facts harmonize; but with what is false, the truth soon hits a wrong note.”