Pride
The sun was setting behind the palace gardens as king Nebuchadnezzar walked along the balcony of his fine house. (Daniel 4) The prophets of Jehovah had told him that his royal authority would be lost if he didn’t stay humble. It was not long before he was eating grass and growing feathers.
God resists the proud and prospers the humble. The devil was in heaven until pride was found in him. He took the longest journey from heaven to hell because of pride.
In Acts12.22, the crowd had barely stopped chanting that Herod was a god before the man dropped dead and the worms began to eat him. God hates pride. Nothing is more horrible to God than pride. Nothing has the power to warp the human soul more than pride. Pride turned an archangel into a devil; imagine what it can do to us. Pride in the heart is what caused the fall of Lucifer and Adam and Eve. It is the grossest of sins and the hardest to eradicate from our lives.
Paul said that men would be proud in the last days. Pride means a high opinion of oneself; it means to appear above another; disdainful, or arrogant in the heart. (Mk 7.19)
Friend, as our chest swells with pride it really only demonstrates, that our intelligence and our hearts understanding of reality, has shrunken.