“Friendship's best,' I said, 'and friendship's forever because no baby can come along to spoil it.”

http://books.google.com/books?id=d8kCAAAAQAAJ&q=%22Because+friendship+is+intercommunication+of+love+therefore+where+love+is+not+mutual+there+can+be+no+friendship%22&pg=PA145#v=onepage
Car l'amitié est un amour mutuel, & s'il n'est mutuel, ce n'est pas amitié.
http://books.google.com/books?id=orIOAAAAQAAJ&q=%22car+l'amiti%C3%A9+est+un+amour+mutuel+%26+s'il+n'est+mutuel+ce+n'est+pas+amiti%C3%A9%22&pg=PA242#v=onepage
Pt. 3, ch. 17
Introduction to the Devout Life (1609)

127 - 134
Fruits of Solitude (1682), Part II
Context: They that love beyond the world cannot be separated by it. Death cannot kill, what never dies. Nor can Spirits ever be divided that love and live in the same Divine Principle; the Root and Record of their Friendship. If Absence be not death, neither is theirs. Death is but Crossing the World, as Friends do the Seas; They live in one another still. For they must needs be present, that love and live in that which is Omnipresent. In this Divine Glass, they see Face to Face; and their Converse is Free, as well as Pure. This is the Comfort of Friends, that though they may be said to Die, yet their Friendship and Society are, in the best Sense, ever present, because Immortal.

Source: Keep the Aspidistra Flying (1936), Ch. 10

Source: Something Wicked This Way Comes

We the People interview (1996)
Context: I do not believe that friendship today can flower out — can come out — of political life. I do believe that if there is something like a political life to be — to remain for us, in this world of technology — then it begins with friendship.
Therefore my task is to cultivate disciplined, self-denying, careful, tasteful friendships. Mutual friendships always. I-and-you and, I hope, a third one, out of which perhaps community can grow. Because perhaps here we can find what the good is.

Source: Savonarola (1881), Candida to Valori in Act I, sc. ii; p. 35.