Love is like a friendship caught on fire. In the beginning a flame, very pretty, often hot and fierce, but still only light and flickering. As love grows older, our hearts mature and our love becomes as coals, deep-burning and unquenchable.

Falling in love is not at all the most stupid thing that people do — but gravitation cannot be held responsible for it. Jotted (in German) on the margins of a letter to him (1933).

Get not your friends by bare compliments, but by giving them sensible tokens of your love.

At the touch of love, everyone becomes a poet.

Fortune and love favor the brave.

He who is in love is wise and is becoming wiser, sees newly every time he looks at the object beloved, drawing from it with his eyes and his mind those virtues which it possesses.

Let love steal in disguised as friendship.

Love yields to business. If you seek a way out of love, be busy; you'll be safe then.

Happy are those who dare courageously to defend what they love.

If you want to be loved, be lovable.