True friendship can afford true knowledge. It does not depend on darkness and ignorance.
Friendship improves happiness and abates misery, by the doubling of our joy and the dividing of our grief.
FRIENDSHIP, FRIENDSHIP IMPROVES HAPPINESS
You can always tell a real friend: when you've made a fool of yourself he doesn't feel you've done a permanent job.
An insincere and evil friend is more to be feared than a wild beast a wild beast may wound your body, but an evil friend will wound your mind.
FRIENDSHIP, AN EVIL FRIEND WILL WOUND YOUR MIND
I don't need a friend who changes when I change and who nods when I nod my shadow does that much better.
It is important to our friends to believe that we are unreservedly frank with them, and important to friendship that we are not.