Know how to solve every problem that has been solved.
Work as hard and as much as you want to on the things you like to do the best.
Only realistic flight schedules should be proposed, schedules that have a reasonable chance of being met. If in this way the government would not support them, then so be it. NASA owes it to the citizens from whom it asks support to be frank, honest, and informative.
Today's brains are yesterday's mashed potatoes.
No one really understands quantum mechanics.
The test of all knowledge is experiment.