"Today the world changes so quickly that in growing up we take leave not just of youth but of the world we were young in"

"The young man knows the rules, but the old man knows the exceptions"

"The best preparation for good work tomorrow is to do good work today"

"Neurotics complain of their illness, but they make the most of it, and when it comes to talking it away from them they will defend it like a lioness her young"

"Youth is not a question of years: one is young or old from birth"

"Young men have a passion for regarding their elders as senile"

"In thinking about nanotechnology today, what's most important is understanding where it leads, what nanotechnology will look like after we reach the assembler breakthrough"

"No worse fate can befall a young man or woman than becoming prematurely entrenched in prudence and negation"

"In America the young are always ready to give to those who are older than themselves the full benefits of their inexperience"

"I like to use the hard times in the past to motivate me today"

"The science of today is the technology of tomorrow"