“When reason fails, the devil helps!”

“Clearly, he now had not to be anguished, not to suffer passively, by mere reasoning about unresolvable questions, but to do something without fail, at once, quickly.”

“I am glad that at such a moment my young man turned out to be not so reasonable; the time will come for an intelligent man to be reasonable, but if at such an exceptional moment there is no love to be found in a young man's heart, then when will it come?”

“[The Devil] And after all, who knows whether proof of the devil is also proof of God? I want to join an idealist society and form an opposition within it: 'I'm a realist,' I'll say, 'not a materialist,' heh, heh!”

“Yes, the laws of self-preservation and of self-destruction are equally powerful in this world. The devil will hold his empire over humanity until a limit of time which is still unknown. You laugh? You do not believe in the devil? Scepticism as to the devil is a French idea, and it is also a frivolous idea. Do you know who the devil is? Do you know his name? Although you don't know his name you make a mockery of his form, following the example of Voltaire. You sneer at his hoofs, at his tail, at his horns—all of them the produce of your imagination! In reality the devil is a great and terrible spirit, with neither hoofs, nor tail, nor horns; it is you who have endowed him with these attributes! But… he is not the question just now!”

“No, evidently habit means a lot. The devil knows what habit can do to a person.”

“[The Devil] My best feelings, gratitude, for example, are formally forbidden solely because of my social position.”