If you can't explain what you are doing to a nine-year-old, then either you still don't understand it very well, or it's not all that worthwile in the first place.

All such action would cease if those powerful elemental forces were to cease stirring within us.

If you can't explain it simply, you don't understand it well enough.

Engineering is not only study of 45 subjects but it is moral studies of intellectual life. Make things as simple as possible..but not simpler.

Education is not received. It is achieved.

Incompetence is the true crisis.

I am also convinced that one gains the purest joy from spirited things only when they are not tied in with earning one's livelihood.