The examined life is the only life worth living.
To be uncertain is to be uncomfortable, but to be certain is to be ridiculous.
A man should inure himself to voluntary labor, and not give up to indulgence and pleasure, as they beget no good constitution of body nor knowledge of mind.
The warm love has the coldest end.
An unexamined life is a life of no account.
The beginning of wisdom is a definition of terms.