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

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.

A definition is the enclosing a wilderness of idea within a wall of words.

Though analogy is often misleading, it is the least misleading thing we have.

We all love best not those who offend us least, but those who make it most easy for us to forgive them.

Men of Science. If they are worthy of the name they are indeed about God's path and about his bed and spying out all his ways.

The foundations which we would dig about and find are within us, like the kingdom of heaven, rather than without.