My teacher claims that he is utterly emotionless; according to him, he isn’t clouded by emotions of any form, and has no emotional desire. He argues that any emotions he appears to possess are simply superficial occurrences, with the purpose of manipulating others. He argues that he is utterly objective and consequently, completely exclusive from any form of bias. My question is that surely somebody who objectively chooses to use logic over any form of emotional guidance and has “no emotional desire whatsoever”, is therefore exhibiting a desire in itself? Surely, if one assumes logic as their only form of reasoning, the logic must be based upon basic desires and principles, therefore denoting an emotional presence? I would be grateful if somebody could enlighten me!

I worry that framing the question this way begs the question -- you seem to assume that any 'choice' comes from or out of 'desire', but isn't that precisely what's at issue? I think we'd need to get a lot clearer on what a 'desire' is before we could answer the question in a satisfactory way ... For example, you seem to consider 'desire' a kind of 'emotion', but philosophers of mind typically would distinguish the two in various ways -- perhaps desires share a kind of 'qualitative character' or 'qualia' with emotions, but desires are typically characterized by having an object or content, one often expressible in words, in a way emotions are typically characterized as 'raw feelings' that may or may not have a specific object or content -- Once you separate desires from emotions, you then need to define desire in such a way as to make it clear that every choice comes from some desire ..... (Charles mentions Spock -- consider this thought. Suppose you could program a computer to do all sorts of complex...