The surest way to corrupt a youth is to instruct him to hold in higher esteem those who think alike than those who think differently.

Not contentment, but more power; not peace at any price, but war; not virtue, but efficiency (virtue in the Renaissance sense, virtu , virtue free of moral acid).

Just as bones, tissues, intestines, and blood vessels are enclosed in a skin that makes it possible to bear the sight of a human being, so the agitations and passions of the soul are wrapped up in vanity: it is the soul's skin.

Now know I well what people sought formerly above all else when they sought Teachers of virtue. Good sleep they sought for themselves, and poppy-head virtues to promote it! To all those be-lauded sages of the academic chairs, wisdom was sleep Without dreams: they knew no higher significance of life. Even at present, to be sure, there are some like this preacher of virtue, and not always so honorable: but their time is past. And not much longer do they stand: there they already lie. Blessed are those drowsy ones: for they shall soon nod to sleep.-Thus spoke Zarathustra.

Great men's errors are to be venerated as more fruitful than little men's truths.

The destiny of the human race is to widen the gap separating it from the lower races of animals. Any code of morality which retains its permanence and authority after the conditions of existence which gave rise to it have changed, works against this upward progress of man.

A bad conscience is easier to cope with than a bad reputation.