What, then, shall we do? someone may ask. What else, indeed, than devote ourselves to the care of our souls, keeping all our leisure free from other things. Accordingly, we should not be slaves of the body, except so far as is strictly necessary; but our souls we should supply with all things that are best, through philosophy freeing them, as from a prison, from association with the passions of the body.

We must try to keep the mind in tranquility. For just as the eye which constantly shifts its gaze, now turning to the right or to the left, now incessantly peering up and down, cannot see distinctly what lies before it, but the sight must be fixed firmly on the object in view if one would make his vision of it clear, so too man's mind when distracted by his countless worldly cares cannot focus itself distinctly on the truth.