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And do not walk arrogantly in the earth, for you cannot bore
through the earth nor can you be as tall as the mountains.
17:37

Arrogance is an outward expression of an inflated ego. A big ego is the most serious obstacle to submission to God. It is the ego inside many humans that prevents them from accepting God's omnipotence and absolute authority. Consequently, it is the ego that will undoubtedly stand between them and redemption into God's kingdom:

Have you seen the one who has taken his personal desire as his god? Would you be his trustee? 25:43

This is why the command to "kill your ego" is one of the first commandmants in the Quran:

And when Moses said to his people, "O my people, you have wronged yourselves by setting up the calf, so repent to your Initiator and kill your egos. This is better for you at your Initiator." So He has redeemed you. He is the Redeemer, the Merciful. 2:54