The proud depend upon the world to tell them whether they have value or not. Their self-esteem is determined by where they are judged to be on the ladders of worldly success. They feel worthwhile as individuals if the numbers beneath them in achievement, talent, beauty, or intellect are large enough. Pride is ugly. If we love God, do His will, and fear His judgment more than men's, we will have self-esteem.
Pride is a damning sin in the true sense of that word.
It limits or stops progression. The proud are not easily taught. They won't change their minds to accept truths, because to do so implies they have been wrong. Our degree of pride determines how we treat our God and our brothers and sisters. Christ wants to lift us to where He is.