A civilization is built on what is required of men, not on that which is provided for them.

The root of all superstition is that men observe when a thing hits, but not when it misses.

The same principles which at first view lead to skepticism, pursued to a certain point, bring men back to common sense.

As long as man continues to be the ruthless destroyer of lower living beings he will never know health or peace. For as long as men massacre animals, they will kill each other.

I hate this fast growing tendency to chain men to machines in big factories and deprive them of all joy in their efforts - the plan will lead to cheap men and cheap products.