"The stone that was rolled before Christ's tomb might appropriately be called the philosopher's stone because its removal gave not only the pharisees but, now for 1800 years, the philosophers so much to think about."
"la vida sólo puede ser entendida mirando hacia atrás; aunque deba ser vivida mirando hacia adelante"
"Therefore do not deceive yourself! Of all deceivers fear most yourself!"
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true."
"Life can only be understood backwards; but it must be lived forwards."
"No woman in maternity confinement can have stranger and more impatient wishes than I have."