At 35 I'm definitely starting to feel more like a grown-up than I ever have. There's nothing in my life that is childish or whimsical. Having fun is fantastic and I never want to lose a sense of that – and also I think you have to have that to put into your work or else it's going to feel stiff.
The average person puts only 25% of his energy and ability into his work. The world takes off its hat to those who put in more than 50% of their capacity and stands on its head for those few and far between souls who devote 100%.
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The reward for work well done is the opportunity to do more.