Friendship is the Masterpiece of Nature
Almost every man we meet requires some civility, requires to be humored; he has some fame, some talent, some whim of religion or philanthropy in his head that is not to be questioned, and which spoils all conversation with him. But a friend is a sane man who exercises not my ingenuity, but me. My friend gives me entertainment without requiring any stipulation on my part. A friend, therefore, is a sort of paradox in nature. I who alone am, I who see nothing in nature whose existence I can affirm with equal evidence to my own, behold now the semblance of my being in all its height, variety and curiosity, reiterated in a foreign form; so that a friend may well be reckoned the masterpiece of nature.
Ralph Waldo Emerson, in "Essays - Friendship"