The problem with pride is that it quickly leads to the other sins of arrogance, presumption, malice, jealousy, anger, hostility and these sins, in turn, lead to such behavior as looking down on others, trying to control others, turning away from painful situations instead of helping, giving up when the going gets difficult, losing faith in God to bring the best in all circumstances.  What is inside of us, whether or not we are always aware of it, will be revealed in the choices we make and things we do, or neglect to do.