A friend is someone you share the path with.

There are few things more pathetic than those who have lost their curiosity and sense of adventure, and who no longer care to learn.

I roamed the countryside searching for answers to things I did not understand.

Old age is no place for sissies.

Do not stop thinking of life as an adventure. You have no security unless you live bravely, excitingly, imaginatively.

Plato is my friend; Aristotle is my friend, but my greatest friend is truth.

For friendship, like freedom, must be tended.

We are not enemies, but friends. We must not be enemies. Though passion may have strained, it must not break, our bonds of affection.

You shall judge of a man by his foes as well as by his friends.