Institutio Oratoria

So too the teacher of geometry, music or other subjects which I would class with these, will not be able to create the perfect orator (who like the philosopher ought to be a wise man), but none the less these arts will assist in his perfection. I may draw a parallel from the use of antidotes and other remedies applied to the eyes or to wounds. We know that these are composed of ingredients which produce many and sometimes contrary effects, but mixed together they make a single compound resembling no one of its component parts, but deriving its peculiar properties from all: