Tom Stoppard

When I was younger, I could do something useful just by being free for half a day, but now I need five days to get the world I've left out of my head and ten days or a fortnight not talking to anyone to hold what I need to hold inside my head.

If a man made himself an expert in any particular branch of human activity, there would result the strong tendency that a peculiar aptitude towards the same branch would be found among some of his descendants.