Also, Don, from the end of the letter to Pythocles, there is that pesky word "feelings" again!
QuoteAnd most of all give yourself up to the study of the beginnings and of infinity and of the things akin to them, and also of the criteria of truth and of the feelings, and of the purpose for which we reason out these things.
For these points when they are thoroughly studied will most easily enable you to understand the causes of the details.
But those who have not thoroughly taken these things to heart could not rightly study them in themselves, nor have they made their own the reason for observing them.