Pride - the worst sin according to C.S.Lewis

[Angrboda]

It means that you feel you are more deserving or more important in society than you really are. 

Yeah, it seems to me that pride exists in direct relationship to others. And as such it can be differentiated from terms like confidence or self-esteem, which exist independently of others.

There's a theory of prejudice in psychology called relative deprivation theory. The premise is simple: Groups become dissatisfied with aspects of their lives relative to other groups. The word relative is important because it doesn't matter whether if you are actually deprived in any objective sense, only whether you feel deprived in relation to other people. Racism and hate groups tend to emerge under such conditions.

I think that's potentially a good description of pride—a standard people believe they deserve to have relative to others. And a big part of Christianity has to do with doing away with such standards. To be willing to cross group boundaries, especially ones you feel are beneath you. I remember someone saying once (maybe it was CS Lewis himself), that the most powerful image in Christianity wasn't the cross, but Jesus washing the feet of the disciples.

It would be a bit creepy though for Christians to wear necklaces with a pair of feet dangling from them.