If you cannot explain it simply, you do not understand it enough.

The economists will have to revise their theories of value.

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.

All means prove but blunt instruments, if they have not behind them a living spirit.

The greatest scientists are artists as well.

I once thought that if I could ask God one question, I would ask how the universe began, because once I knew that, all the rest is simply equations. But as I got older I became less concerned with how the universe began. Rather, I would want to know why he started the universe. For once I knew that answer, then I would know the purpose of my own life.

Violence sometimes may have cleared away obstructions quickly, but it never has proved itself creative.