[33] For as in great and dangerous sicknesses a physician sometimes actually takes away parts of the body, aiming at ensuring the sound health of the rest, and as when storms arise the pilot often throws overboard the cargo, out of a prudent regard to the safety of the men sailing in the ship; and yet the physician is not blamed for the mutilation of the body, nor the pilot for the loss of the cargo, but on the contrary both of them are praised as having seen and ensured what was advantageous in preference to what was pleasant;