Exercise dissipates tension, and tension is the enemy of serenity. I found that I worked better and thought more clearly when I was in good physical condition, and so training became one of the inflexible disciplines of my life.

I enjoyed the discipline and solitariness of long-distance running, which allowed me to escape from the hurly-burly of school life.

To be in good moral condition requires at least as much training as to be in good physical condition.

I have better use for my brain than to poison it with alcohol. To put alcohol in the human brain is like putting sand in the bearings of an engine.

As long as there are slaughterhouses there will be battlefields. A vegetarian diet is the acid test of humanitarianism.

If slaughterhouses had glass walls, everyone would be a vegetarian.