A schoolteacher or professor cannot educate individuals, he educates only species.

I am confident of my ability to demonstrate that one can sometimes believe in something and yet not believe in it. Nothing is less fathomable than the systems that motivate our actions.

To be content with life or to live merrily, rather all that is required is that we bestow on all things only a fleeting, superficial glance; the more thoughtful we become the more earnest we grow.

I would give something to know for whose sake precisely those deeds were really done which report says were done for the fatherland.

The more experiences and experiments accumulate in the exploration of nature, the more precarious the theories become. But it is not always good to discard them immediately on this account. For every hypothesis which once was sound was useful for thinking of previous phenomena in the proper interrelations and for keeping them in context. We ought to set down contradictory experiences separately, until enough have accumulated to make building a new structure worthwhile.

Barbaric accuracy - whimpering humility.

Man is a masterpiece of creation, if only because no amount of determinism can prevent him from believing that he acts as a free being.