Meditations 10.38

Remember that this which pulls the strings is the thing which is hidden within: this is the power of persuasion, this is life, this, if one may so say, is man. In contemplating thyself never include the vessel which surrounds thee and these instruments which are attached about it. For they are like to an axe, differing only in this, that they grow to the body. For indeed there is no more use in these parts without the cause which moves and checks them than in the weaver's shuttle, and the writer's pen, and the driver's whip.

Marcus Aurelius, Meditations 10.38, translated by George Long

Bear in mind that what pulls the strings is that Hidden Thing within us: that makes our speech, that our life, that, one may say, makes the man. Never in thy mental picture of it include the vessel that overlies it nor these organs that are appurtenances thereof. They are like the workman's adze, only differing from it in being naturally attached to the body. Since indeed, severed from the Cause that bids them move and bids them stay, these parts are as useless as is the shuttle of the weaver, the pen of the writer, and the whip of the charioteer.

Marcus Aurelius, Meditations 10.38, translated by C. R. Haines