[M]an is a machine made expressly for sorrow; he has only five senses with which to receive pleasure, and suffering comes to him through the whole surface of his body…. The man who does not suffer is an ill-made machine, an imperfect creature… – Claude Tillier (1801–1844), My Uncle Benjamin: A Humorous, Satirical, and

There are people who have an appetite for grief; pleasure is not strong enough and they crave pain. They have mithridatic stomachs which must be fed on poisoned bread, natures so doomed that no prosperity can sooth their ragged and dishevelled desolation. – Ralph Waldo Emerson