This is especially apt for a colleague who is in the middle of a two-weeks of niceness campaign:
1) The last lines of Willy Wonka and the Chocolate Factory:
Willy Wonka: But Charlie, don’t forget what happened to the man who suddenly got everything he he always wanted.
Charlie Bucket: What happened?
Willy Wonka: He lived happily ever after.
2) This visualization of the appropriate work/life decision-making process.