this is a nice summary:
In almost every list, pride or hubris (Greek), is considered the original and most serious of the seven deadly sins, and the source of the others. It is identified as believing that one is essentially better than others, failing to acknowledge the accomplishments of others, and excessive admiration of the personal self.
Dante's definition of pride was "love of self perverted to hatred and contempt for one's neighbour".
In Jacob Bidermann's medieval miracle play, Cenodoxus, pride is the deadliest of all the sins and leads directly to the damnation of the titulary famed Parisian doctor.
In perhaps the best-known example, the story of Lucifer, pride (his desire to compete with God) was what caused his fall from Heaven, and his resultant transformation into Satan.
Pride