The greatest joy of a thinking man is to have searched the explored and to quietly revere the unexplored.

I hate everything that merely instructs me without augmenting or directly invigorating my activity.

Many hammer all over the wall and believe that with each blow they hit the nail on the head.

He who does not think much of himself is much more esteemed than he imagines.

Higher yet and higher out of clouds and night, nearer yet and nearer rising to the light - light, serene and holy where my soul may rest, purified and lowly, sanctified and blest.

Superstition belongs to the essence of mankind and takes refuge, when one thinks one has suppressed it completely, in the strangest nooks and crannies; once it is safely ensconced there, it suddenly reappears.

There is nothing outside of us that is not at the same time in us, and as the external world has its colors the eye, too, has colors.