True friendship implies full confidence, which may only be completely given or completely withdrawn. If friendship has continually to be analyzed, nursed, and cured, it will cause more anguish than love itself, without having love's strength and its remedies. And if this confidence is ill-placed? Well - I would rather be betrayed by a false friend than deceive a true one.

Un Art de Vivre (The Art of Living) (1939) - The Art of Friendship