Paul warned the Church at Ephesus that one of the greatest dangers believers face is the sin of pride. Pride is at the root of all sin because pride puts "I" first!
Romans 12:3 For I say, through the grace given unto me, to every man that is among you, not to think of himself more highly than he ought to think; but to think soberly, according as God hath dealt to every man the measure of faith.
Some may think others aren't as holy as they are or they tend to feel their gifts are superior to others. Some may want to be in control of the church. These people are walking in pride!
Every believer is important to God but none are essential! If The Lord has gifted you, use that gift and let Him have the glory. Don't think it makes you better than others.
If we live the right kind of lives for Jesus, we’ll never be any more or any less than He intends us to be.