One is never just a teacher: One is always - even if not consciously - an advocate of a point of view, a critic of certain positions, an exemplar of someone trying to communicate, a purveyor of images, a practitioner of behavioral standards, a person dealing with, and indeed responsible for, others in common tasks. In teaching, at least, the role of moral agent is inescapable.
The need here is professional closeness tempered by emotional distance.
It is hard to be an apprentice to an unfriendly professor, or even one whose warmth or tolerance wears thin when the going gets hard for the student and help is needed.
One may have a right to be unconventional and even eccentric, so long as one is fully competent and a decent person; but one's ideal as a professor should be to conduct oneself as an admirable human being: just, kind, tolerant, competent, committed, and good-humored.
