"I, the LORD, search the heart, I test the mind, even to give to each man according to his ways, according to the results of his deeds."
Egotism is the glue with which you become stuck on yourself.
"Do nothing from selfishness or empty conceit, but with humility of mind let each of you regard one another as more important than himself; do not merely look out for your own personal interests, but also for the interests of others."
Having a "big head" makes one top-heavy.
"Pride goes before destruction and a haughty spirit before stumbling."
The bigger the head, the smaller the heart.
"Be of the same mind toward one another; do not be haughty in mind, but associate with the lowly. Do not be wise in your own estimation."