There is no such source of error as the pursuit of absolute truth.

There is one class of mind that loves to lean on rules and definitions, and another that discards them as far as possible. A faddist will generally ask for a definition of faddism, and one who is not a faddist will be impatient of being asked to give one.

Friends are like money, easier made than kept.

Inspiration is never genuine if it is known as inspiration at the time. True inspiration always steals on a person; its importance not being fully recognized for some time.

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

It is not sufficiently considered in the hour of exultation, that all human excellence is comparative; that no man performs much but in proportion to what other accomplish, or to the time and opportunities which have been allowed 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.