In childhood be modest, in youth temperate, in adulthood just, and in old age prudent.

To find yourself, think for yourself.

You don't know what you don't know.

Prefer knowledge to wealth, for the one is transitory, the other perpetual.

I know what I do not know.

Where there is reverence there is fear, but there is not reverence everywhere that there is fear, because fear presumably has a wider extension than reverence.

How many things are there which I do not want.