Beyond Good and Evil by Friedrich Nietzsche Chapter 2 Page 19

might be possible for a highly developed man, supposing him to degenerate and go to ruin, to acquire qualities thereby alone, for the sake of which he would have to be honoured as a saint in the lower world into which he had sunk.

There are books which have an inverse value for the soul and the health according as the inferior soul and the lower vitality, or the higher and more powerful, make use of them. In the former case they are dangerous, disturbing, unsettling books, in the latter case they are herald-calls which summon the bravest to THEIR bravery. Books for the general reader are always ill-smelling books, the odour of paltry people clings to them. Where the populace eat and drink, and even where they reverence, it is accustomed to stink. One should not go into churches if one wishes to breathe PURE air.