Friendship is the source of the greatest pleasures, and without friends even the most agreeable pursuits become tedious.

Never contract friendship with a man that is not better than thyself.

Even where friendship is concerned, it takes me a long time to trust people.

Walking with a friend in the dark is better than walking alone in the light.

Be courteous to all, but intimate with few, and let those few be well tried before you give them your confidence.

I don't need a friend who changes when I change and who nods when I nod my shadow does that much better.

Am I not destroying my enemies when I make friends of them?

Caring for but never trying to own may be a further way to define friendship.

Friendship may, and often does, grow into love, but love never subsides into friendship.

Nothing but heaven itself is better than a friend who is really a friend.