Seneca

“ Do you think that such evident marks of the body are stamped upon us by anything else than body? 6. And if emotions are corporeal, so are the diseases of the spirit – such as greed, cruelty, and all the faults which harden in our souls, to such an extent that they get into an incurable state. Therefore evil is also, and all its branches – spite, hatred, pride; 7. and so also are goods, first because they are opposite poles of the bad, and second because they will manifest to you the same symptoms. Do you not see how a spirit of bravery makes the eye flash? ”

“ How joy produces calm? How sternness begets stiffness? How gentleness produces relaxation? These qualities are therefore bodily; for they change the tones and the shapes of substances, exercising their own power in their own kingdoms. ”

“ We dull our fine edge by such superfluous pursuits; these things make men clever, but not good. 12. Wisdom is a plainer thing than that; nay, it is clearly better to use literature for the improvement of the mind, instead of wasting philosophy itself as we waste other efforts on superfluous things. Just as we suffer from excess in all things, so we suffer from excess in literature ”