Kathy Sierra:
Willpower and cognitive processing draw from the same pool of resources.
Spend hours at work on a tricky design problem? You’re more likely to stop at Burger King on the drive home. Hold back from saying what you really think during one of those long-ass, painful meetings? You’ll struggle with the code you write later that day.
Your cognitive resource tank is finite, and precious. Spend it wisely.
If you’re building something people use? Help other people spend their tank wisely too.