Energy cannot be created or destroyed, it can only be changed from one form to another.

The foundation of morality should not be made dependent on myth nor tied to any authority lest doubt about the myth or about the legitimacy of the authority imperil the foundation of sound judgment and action.

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

We can invent as many theories we like, and any one of them can be made to fit the facts. But that theory is always preferred which makes the fewest number of assumptions.

The economists will have to revise their theories of value.

Time is an illusion.

Scientists were rated as great heretics by the church, but they were truly religious men because of their faith in the orderliness of the universe.