Never give advice in a crowd.

No more war! Never again war! If you wish to be brothers, drop your weapons.

Never reach out your hand unless you're willing to extend an arm.

Of all human activities, man's listening to God is the supreme act of his reasoning and will.

Physics does not change the nature of the world it studies, and no science of behavior can change the essential nature of man, even though both sciences yield technologies with a vast power to manipulate the subject matters.

If you want peace work for justice.