Friendship, like credit, is highest when it is not used.

The rule of friendship means there should be mutual sympathy between them, each supplying what the other lacks and trying to benefit the other, always using friendly and sincere words.

How can sincerity be a condition of friendship? A taste for truth at any cost is a passion which spares nothing.

It may happen sometimes that a long debate becomes the cause of a longer friendship. Commonly, those who dispute with one another at last agree.

Friendship is two-sided. It isn't a friend just because someone's doing something nice for you. That's a nice person. There's friendship when you do for each other. It's like marriage - it's two-sided.