"To sit alone with my conscience will be judgment enough for me."

"To the Nahuas, words were flowers, metaphors that gave birth to thoughts and actions."

"They say that facing oneself is the sign of a zany man, but facing this flabby belly requires a lot of courage."

"If we are going to stick to this damned quantum-jumping, then I regret that I ever had anything to do with quantum theory."

"In the end, we will remember not the words of our enemies, but the silence of our friends."

"There is no 'royal road' to geometry."

"So when you are listening to somebody, completely, attentively, then you are listening not only to the words, but also to the feeling of what is being conveyed, to the whole of it, not part of it."

"Never forget the days I spent with you. Continue to be my friend, as you will always find me yours."

"Better were it to be unborn than to be ill bred."

"Clearly he had his own strange way of judging things. I suspect he acquired it from the gospels."

"Digressions, objections, delight in mockery, carefree mistrust are signs of health; everything unconditional belongs in pathology."

"We can learn nothing except by going from the known to the unknown."