Whenever we are tempted to throw good money after bad in terms of human living, let’s stop and ask ourselves these three questions:
- How much does this thing I am worrying about really matter to me?
- At what point shall I set a “stop-loss” order on this worry — and forget it?
- Exactly how much shall I pay for this whistle? Have I already paid more than it is worth?
~ Dale Carnegie, How To Stop Worrying And Start Living (1944)