Why does success make some people overconfident?

Why does success make some people overconfident?

Success is usually considered a measure of perfection. When people feel perfect, it sometimes makes them self-centred and arrogant. Someone's achievements might make them the best in one aspect of life, not perfect in every aspect. 

Sometimes when a person achieves success, they feel they have become the best in everything. A false sense of perfection deters one's growth and even relationships. Neither do you become willing to improve, nor do you consider other people's opinions.

No matter how successful you are or what you have achieved, stay humble and be open to learning more. Success only lasts for those who remain humble and are willing to improve.