The downstream effects are unknown. Do your best and hope for the best. If you're improving the world-however you define that-consider your job well done.

Role models who push us to exceed our limits, physical training that removes our spare tires, and risks that expand our sphere of comfortable action are all examples of eustress—stress that is healthful and the stimulus for growth.

Different is better when it is more effective or more fun.

Which 20% of sources are causing 80% of my problems and unhappiness? Which 20% of sources are resulting in 80% of my desired outcomes and happiness?

Having a size 9 foot is fantastic because almost all of the shoe companies do their prototyping in size 9, so if you visit a place like Nike headquarters, you can try every sort of wacky, out-there model.

Alternating periods of activity and rest is necessary to survive, let alone thrive. Capacity, interest, and mental endurance all wax and wane. Plan accordingly.

If you don't have time, you don't have priorities.