[101] but it is necessary to employ all these things not so much for whatever objects can possibly be effected, but for those that are best; for the sight can perceive all colours and all shapes; but still it ought to behold only things worthy of light, and not of darkness. Again, the ear can receive all kinds of sounds; but some it ought to disregard; for myriads of the things that are said are disgraceful. Nor, O foolish and arrogant man, because nature has given you the faculty of taste, ought you to fill yourself insatiably with everything, like a cormorant; for there are many things not merely among such as are nutritious, but of those which are exceedingly so, which have, nevertheless, produced diseases accompanied with great suffering.