It is nothing but fanaticism and beautiful soulism to expect very much (or even, much only) from humanity when it has forgotten how to wage war.

What is bad? All that proceeds from weakness

Growth in wisdom can be measured precisely by decline in bile.

School has no task more important than to teach strict thought, cautious judgment, and logical conclusions, hence it must pay no attention to what hinders these operations, such as religion, for instance.

And if a man goes through fire for his doctrine - what does that prove? Verily, it is more if your own doctrine comes out of your own fire.

Phlegmatic natures can be inspired to enthusiasm only by being made into fanatics.

The press, the machine, the railway, the telegraph are premises whose thousand-year conclusion no one has yet dared to draw.