As I have written before, Jacques Lusseyran was a French writer who took part in the Resistance against the German Occupation, and he continued to organize groups against the Nazis even after he was sent to Buchenwald concentration camp. His work was all the more striking because he was totally blind from the age of 8, following an accident at school. His experiences give him a certain authority when it comes to reflections on what makes for contentment or unhappiness:

Unhappiness, I saw then, comes to each of us because we think ourselves at the center of the world, because we have the miserable conviction that we alone suffer to the point of unbearable intensity. Unhappiness is always to feel oneself imprisoned in one’s own skin, in one’s own brain.

Jacques Lusseyran.