“We are always trying to convert people to a belief in our own explanation of the universe. We think that the more people there are who believe as we do, the more certain it will be that what we bel...”

“Death is our constant companion, and it is death that gives each person's life its true meaning.”

“Human beings are the only ones in nature who are aware that they will die. For that reason and only for that reason, I have a profound respect for the human race, and I believe that its future is g...”

“Still, being fragile creatures, humans always try to hide from themselves the certainty that they will die. They do not see that it is death itself that motivates them to do the best things in thei...”

“We must never stop dreaming. Dreams provide nourishment for the soul, just as a meal does for the body.”

“Once a problem is solved, its simplicity is amazing.”

“I feel like every project I work on is a dream project, so long as I am learning.”

“Love, too, has to be learned.”

“Every pain is a lesson.”

“You cannot teach a man anything, you can only help him find it within himself.”

“It is easier to write a book with footnotes than the same book written so that children can understand it.”

“I never teach my pupils, I only attempt to provide the conditions in which they can learn.”