“The antidote for fifty enemies is one friend.”

“He is his own best friend and takes delight in privacy whereas the man of no virtue or ability is his own worst enemy and is afraid of solitude.”

“Without friends, no one would want to live, even if he had all other goods.”

“A friend to all is a friend to none.”

“We should behave to our friends as we would wish our friends behave to us”

“A friend is a second self.”

“A friend is a second self, so that our consciousness of a friend's existence...makes us more fully conscious of our own existence.”