Note habits as defined depend on the person (or group) they are a habit of, and on the conditions it may be a habit in. Habits are mostly learned, though many habits are not learned consciously but grow upon one as one lives, simply by automatically learning to associate this X with that Y rather than with something else.

Thus one learns to habitually expect all manner of things and behaviors, both of human beings and other things, and thus inclines to believe, feel or do all manner of things based on these expectations.