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

[GrandizerII]

By all means, be proud of the things you have accomplished, or of the kind of person you are, or whatever -- as long as you're realistic about the causal factors involved that led to these accomplishments or to the kind of character you are. If you disregard the support of other people who were there for you as you were still working towards your goal, or forget that you are who you are because of genetic/environmental factors beyond your control, then this kind of pride in one's self can become delusional and cause harm to your relationships with others (many people tend to find that kind of pride quite off-putting, after all).