Meditations by Marcus Aurelius Book 10 Page 42

instruments that it hath annexed unto it, let them not trouble thy thoughts.

For of themselves they are but as a carpenter’s axe, but that they are born with us, and naturally sticking unto us. But otherwise, without the inward cause that hath power to move them, and to restrain them, those parts are of themselves of no more use unto us, than the shuttle is of itself to the weaver, or the pen to the writer, or the whip to the coachman.