In order for the wheel to turn, for life to be lived, impurities are needed, and the impurities of impurities in the soil, too, as is known, if it is… - Primo Levi

...(he) reminded me by his presence, by his natural and plain manner of being good, that there still existed a just world outside our own, something and someone still pure and whole, not corrupt, not savage, extraneous to hatred and terror; something difficult to define, a remote possibility of good, but for which it was worth surviving.

I read somewhere — and the person who wrote this was not a mountaineer but a sailor — that the sea’s only gifts are harsh blows and, occasionally, the chance to feel strong. Now, I don’t know much about the sea, but I do know that that’s the way it is here. And I also know how important it is in life not necessarily to be strong but to feel strong, to measure yourself at least once, to find yourself at least once in the most ancient of human conditions, facing blind, deaf stone alone, with nothing to help you but your own hands and your own head.

If it is true that there is no greater sorrow than to remember a
happy time in a state of misery, it is just as true that calling up a
moment of anguish in a tranquil mood, seated quietly at one's desk, is
a source of profound satisfaction.