The truth is every Christian messes up. No Christian does everything right. No Christian can say “look, I’m better than you, I’ve done everything right.”
As a result of this, we all need each other. What one lacks, another can supply.
1 Corinthians 1:27-29 God hath chosen the foolish things of the world to confound the wise; and God hath chosen the weak things of the world to confound the things which are mighty;
And base things of the world, and things which are despised, hath God chosen, yea, and things which are not, to bring to nought things that are:
That no flesh should glory in his presence.
It’s that last part.