I have never looked upon ease and happiness as ends in themselves. This ethical basis I call the ideal of the pigsty.

[Mystery] is the fundamental emotion that stands at the cradle of true art and true science.

Student is not a container you have to fill but a torch you have to light up.

Although words exist for the most part for the transmission of ideas, there are some which produce such violent disturbance in our feelings that the role they play in the transmission of ideas is lost in the background.

Our schoolbooks glorify war and conceal its horrors. They indoctrinate children with hatred. I would teach peace rather than war, love rather than hate.

Morality is of the highest importance - but for us, not for God.

Heroism on command, senseless violence, and all the loathsome nonsense that goes by the name of patriotism - how passionately I hate them!