"The greater the love, the greater the tragedy when it's over."

"It is not the quantity of knowledge but the quality of knowledge that determines the future of humanity."

"The changes in our life must come from the impossibility to live otherwise than according to the demands of our conscience."

"The higher the man, the more he is dependent on other people, and the less free he is."

"There are no conditions to which a man cannot get accustomed, especially if he sees that all around him are living in the same way."