My friend...care for your psyche...know thyself, for once we know ourselves, we may learn how to care for ourselves

Let he who would move the world, first complete an environmental impact assessment and a 90-day public comment period.

To know, is to know that you know nothing. That is the meaning of true knowledge. For a man who claims to have knowledge, while actually knowing nothing, is less smarter than you, who claim to know nothing.

I believe that we cannot live better than in seeking to become better, nor more agreeably than having a clear conscience.

There are beds and tables in the world - plenty of them, are there not? But there are only two ideas or forms of them - one the idea of a bed, the other of a table.

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

I have lived long enough to learn how much there is I can really do without.... He is nearest to God who needs the fewest things.