My friends are my estate. Forgive me then the avarice to hoard them.

Emily Dickinson

The proper office of a friend is to side with you when you are in the wrong. Nearly anybody will side with you when you are in the right...

Mark Twain

The only reward of virtue is virtue; the only way to have a friend is to be one.

Ralph Waldo Emerson

Hold a true friend with both your hands.

Friedrich Nietzsche

Tell me what company you keep, and I'll tell you what you are.

Miguel de Cervantes