The hardest thing to see is what is in front of your eyes.

It is much easier to meet with error than to find truth; error is on the surface, and can be more easily met with; truth is hid in great depths, the way to seek does not appear to all the world.

Pity on the person who has become accustomed to seeing in necessity something arbitrary, who ascribes to the arbitrary some sort of reason, and even claims that following that sort of reason has religious value.

Oh, happy he who still hopes he can emerge from Error's boundless sea! - Faust.

For the butterfly, mating and propagation involve the sacrifice of life, for the human being, the sacrifice of beauty.

As soon as any one belongs to a narrow creed in science, every unprejudiced and true perception is gone.

Truth is contrary to our nature, not so error, and this for a very simple reason: truth demands that we should recognize ourselves as limited, error flatters us that, in one way or another, we are unlimited.