True friendship ought never to conceal what it thinks.

Friends show their love in times of trouble, not in happiness.

There are no rules for friendship. It must be left to itself. We cannot force it any more than love.

Never have a companion that casts you in the shade.

Wishing to be friends is quick work, but friendship is a slow ripening fruit.

Depth of friendship does not depend on length of acquaintance.

Friendship is always a sweet responsibility, never an opportunity.

That friendship will not continue to the end which is begun for an end.

Friendship without self-interest is one of the rare and beautiful things of life.

Caring for but never trying to own may be a further way to define friendship.