It is in vain that a man of sound mind and cool temper understands the condition of such a wretched being... He can no more communicate his own wisdom to him than a healthy man can instil his strength into the invalid by whose bedside he is seated.

No two men see the world exactly alike, and different temperaments will apply in different ways a principle that they both acknowledge. The same man will, indeed, often see and judge the same things differently on different occasions: early convictions must give way to more mature ones. Nevertheless, may not the opinions that a man holds and expresses withstand all trials, if he only remains true to himself and others?

What have the Germans gained by their boasted freedom of the press, except the liberty of abusing each other as they like?

Deeply earnest and thoughtful people stand on shaky footing with the public.

A person is never happy till their vague strivings has itself marked out its proper limitations.

The Primal Plant is going be the strangest creature in the world, which Nature herself must envy me. With this model and the key to it, it will be possible to go on for ever inventing plants and know that their existence is logical; that is to say, if they do not actually exist, they could, for they are not the shadowy phantoms of a vain imagination, but possess an inner necessity and truth. The same law will be applicable to all other living organisms.

No one can take from us the joy of the first becoming aware of something, the so-called discovery. But if we also demand the honor, it can be utterly spoiled for us, for we are usually not the first. What does discovery mean, and who can say that he has discovered this or that? After all it's pure idiocy to brag about priority; for it's simply unconscious conceit, not to admit frankly that one is a plagiarist.