The best slave is the one who thinks he is free.
Error is acceptable as long as we are young; but one must not drag it along into old age.
Theories are usually the over-hasty efforts of an impatient understanding that would gladly be rid of phenomena, and so puts in their place pictures, notions, nay, often mere words.
Whoever aspiring, struggles on, for him there is salvation.
Patriotism ruins history.
Flowers are the beautiful hieroglyphics of nature with which she indicates how much she loves us.