Viktor E. Frankl said this quote
“ The attempt to develop a sense of humor and to see things in a humorous light is some kind of a trick learned while mastering the art of living. Yet it is possible to practice the art of living even in a concentration camp, although suffering is omnipresent. To draw an analogy: a man's suffering is similar to the behavior of gas. If a certain quantity of gas is pumped into an empty chamber, it will fill the chamber completely and evenly, no matter how big the chamber. Thus suffering completely fills the human soul and conscious mind, no matter whether the suffering is great or little. Therefore the size of human suffering is absolutely relative. ”