“Sanya, Knight of the Cross: Laugh whenever you can. Keeps you from killing yourself when things are bad. That and vodka.”

Variant: Because he knows you have to laugh at the things that hurt you just to keep yourself in balance, just to keep the world from running you plumb crazy.
Source: One Flew Over the Cuckoo's Nest (1962), Ch. 25
Context: While McMurphy laughs. Rocking farther and farther backward against the cabin top, spreading his laugh out across the water — laughing at the girl, at the guys, at George, at me sucking my bleeding thumb, at the captain back at the pier... and the Big Nurse and all of it. Because he knows you have to laugh at the things that hurt you just to keep yourself in balance, just to keep the world from running you plumb crazy. He knows there's a painful side; he knows my thumb smarts and his girlfriend has a bruised breast and the doctor is losing his glasses, but he won't let the pain blot out the humor no more'n he'll let the humor blot out the pain.

Source: Under the Dome

Go Rin No Sho (1645), The Wind Book
Context: Whenever you cross swords with an enemy you must not think of cutting him either strongly or weakly; just think of cutting and killing him. Be intent solely on killing the enemy. Do not try to cut strongly and, of course, do not think of cutting weakly. You should only be concerned with killing the enemy.

Source: All About Me (New York: Ballantine Books, 2021), p. 451

Psychomagic: The Transformative Power of Shamanic Psychotherapy (2010)

Source: Squire

Interview with The Boston Globe (1989)

Source: The Poisonwood Bible

Source: The Thirteenth Tale