The concern of those monks and nuns was frugality, voluntary privation, and self-mortification. In general, selection operates most powerfully during times of famine or other privation. Happiness in this context is understood as the production of pleasure or privation of pain. Captives often suffered from privation on voyages to North Africa if taken at a distance. Nonetheless, the life was one of extraordinary endurance and privation. It is a subset of the fallacy of relative privation. In the extreme privation of post-war Germany Zuse was unable to build computers. Instead, evil is rather the absence or lack ("privation") of good. The war caused significant economic privation in the country. In 1282, after years of privation, Nichiren fell ill. The idea of privation is foreign to it.