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

By far the greatest and most admirable form of wisdom is that needed to plan and beautify cities and human communities.

To use words and phrases in an easygoing manner without scrutinizing them too curiously is not in general a mark of ill-breeding. On the contrary, there is something low-bred in being too precise. But sometimes there is no help for it

I am confident that there truly is such a thing as living again, that the living spring from the dead, and that the souls of the dead are in existence.

Are you not ashamed of heaping up the greatest amount of money and honor and reputation, and caring so little about wisdom and truth and the greatest improvement of the soul?

The understanding of mathematics is necessary for a sound grasp of ethics.

The highest realms of thought are impossible to reach without first attaining an understanding of compassion.