A book full of brilliance imparts some of it even to its opponents.

He who fights too long against dragons becomes a dragon himself; and if you gaze too long into the abyss, the abyss will gaze into you.

Certitude drives people mad.

Many a one cannot loosen his own fetters, but is nevertheless his friend's emancipator.

What do you regard as most humane? To spare someone shame.

Every profound spirit needs a mask: even more, around every profound spirit a mask is continually growing.

A strong and well-constituted man digests his experiences (deeds and misdeeds all included) just as he digests his meats, even when he has some tough morsels to swallow.