"The only way for a rich man to be healthy is by exercise and abstinence, to live as if he were poor."

"The most influential of all educational factors is the conversation in a child's home."

"The first glass is for myself, the second for my friends, the third for good humor, and the forth for my enemies."

"You may keep your beauty and your health, unless you destroy them yourself, or discourage them to stay with you, by using them ill."

"Who knows what technology will emerge in the next five years, let alone 20. Yet the education we provide our children now is supposed to last for decades. We cannot train them for jobs that do not even exist yet, but we can provide them with the minds and tools they'll need to adapt to our ever-changing set of circumstances."

"Perhaps the best motivation for going to Mars is political. It is obvious that no single nation currently has either the will or the resources to do it alone, but a consortium of nations and space agencies could achieve it within 20 years."

"These groups within a society can he distinguished according as to whether, like an army or an orchestra, they function as a single body or whether they are united merely to defend their common interests and otherwise function as separate individuals."

"Solitude is not something you must hope for in the future. Rather, it is a deepening of the present, and unless you look for it in the present you will never find it."