True strength is not in the muscles, but in the heart.

To be a moral human being is to pay, be obliged to pay, certain kinds of attention.

"We all want things to stay the same. Settle for living instead."

People with a clear sense of identity know who they are and what they stand for. They have a strong sense of self and are not easily swayed by others.

The true value of a mathematical theory lies in its ability to connect seemingly unrelated ideas.