Strive for excellence in few things, rather than good performance in many.
I make it a personal rule never to do anything that I don't really care about. It is surprising how much this cuts out.
To get useful new ideas, we must go beyond our immediate circle and make contact with distant parts of the social system.
Only do the thing we are best at doing and enjoy most.
Hard work leads to low returns. Insight and doing what we want lead to high returns.
Conventional wisdom is not to put all of your eggs in one basket. 80/20 wisdom is to choose a basket carefully, load all your eggs into it, and then watch it like a hawk.