"However great my sufferings may have been, I do not seek to diminish them by comforting myself with vain hopes, and thoughts of a future and unknown happiness. This same courage of my convictions has led me to a philosophy of despair, which I do not hesitate to accept. It is the cowardice of men, who would fain regard existence as something very valuable, that instigates them to consider my philosophical opinions as the result of my sufferings, and that makes them persist in charging to my material circumstances that which is due to nothing but my understanding. Before I die, I wish to make protest against this imputation of weakness and trifling; and I would beg of my readers to burn my writings rather than attribute them to my sufferings."
January 1, 1970
https://en.wikiquote.org/wiki/Philosophical_pessimism