It sometimes happens to us, living beings of this age that we are, that we experience some kind of inner conflict; a conflict between what seems to our intellect or reason(*) and the feeling or "heart" as many would call it. An example would be a job that looks quite good on paper, but the individual decides to reject it finally, not necessarily because any specific reason he could pinpoint, but because it didn't "feel" right.
I am mostly interested in an account of the classical period that describes such an inner conflict (and it may quite board in range - something like acting against "conscience" even), and would be especially happy to find what are the entities in the conflict as "head/brain" and "heart". Originally I though that ego and animus could be good candidates for "head" and "heart" based on several quotes, but I have my seconds thought now.
(*) as much as we have one (or should I speak for myself). For genuine rational entity seems to be quite rare. It can be called many times "justificator" as it merely post-factum used to justify a decisions taken based on irrational causes (not that I'm saying this a bad thing).