Spare the rod and spoil the child.

Creativity is so delicate a flower that praise tends to make it bloom, while discouragement often nips it in the bud.

History is a bucket of ashes.

Since God himself cannot change the past, He is obliged to tolerate the existence of historians.

Prayers are to men as dolls are to children. They are not without use and comfort, but it is not easy to take them very seriously.

You cannot have a thing "matter" by itself which shall have no motion in it, nor yet a thing "motion" by itself which shall exist apart from matter; you must have both or neither. You can have matter moving much, or little, and in all conceivable ways; but you cannot have matter without any motion more than you can have motion without any matter that is moving.

Arguments are like fire-arms which a man may keep at home but should not carry about with him.