I've read De Anima and its commentaries by several people both in Latin and in Greek, but I didn't realise that they were the issues from self-observation.
Come to think of that, they were written by observing the mind, a prototype of psychology.
But the self-observation was purely theoretical and, in Neo-Platonists very imaginary and fantastic in a bad sense, and was not connected with practice for some good end, for example amending of mental defects, improvement of intelligence.
So they got gradually boring to me.
De Anima also observes the body, and the way of observing includes self-observation as well as the observation from outside,
but the observations were not very deep, and again were theoretical and not connected to practice for some good end, that is, improvement of health.
In one word, the observation in De Anima was too much theoretical, having no aim in the observation.
Now do you get some image about what kind of books I want to read ?
I think what I want to find is a self-observation for the purpose of self-improvement.
Turning back to Descartes, do his writings seem to interest me ?
I totally forgot what was written in Descartes which I read in college.