Non cogitant, ergo non sunt.

Ambition and suspicion always go together.

When an acquaintance goes by I often step back from my window, not so much to spare him the effort of acknowledging me as to spare myself the embarrassment of seeing that he has not done so.

A man has virtues enough if he deserves pardon for his faults on account of them.

The greatest events occur without intention playing any part in them; chance makes good mistakes and undoes the most carefully planned undertaking. The world's greatest events are not produced, they happen.

The most heated defenders of a science, who cannot endure the slightest sneer at it, are commonly those who have not made very much progress in it and are secretly aware of this defect.

With God thoughts are colors, with us they are pigments-even the most abstract one may be accompanied by physical pain.