Without books the development of civilization would have been impossible. They are the engines of change, windows on the world, "Lighthouses" as the poet said "erected in the sea of time." They are companions, teachers, magicians, bankers of the treasures of the mind, Books are humanity in print.

Unrest is the mark of existence.

As a general rule, the longer a man's fame is likely to last, the later it will be in coming; for all excellent products require time for their development.

To feel envy is human, to savour schadenfreude is devilish

...in the end every one stands alone, and the important thing is who it is that stands alone.

The world is not a factory and animals are not products for our use

The fourfold root of the principle of sufficent reason is "Anything perceived has a cause. All conclusions have premises. All effects have causes. All actions have motives.