Rom 12:4-6
4 In this way we are like the various parts of a human body. Each part gets its meaning from the body as a whole, not the other way around. 5 The body we're talking about is Christ's body of chosen people. Each of us finds our meaning and function as a part of his body. But as a chopped-off finger or cut-off toe we wouldn't amount to much, would we? So since we find ourselves fashioned into all these excellently formed and marvelously functioning parts in Christ's body, 6 let's just go ahead and be what we were made to be, without enviously or pridefully comparing ourselves with each other, or trying to be something we aren't.

No comparing. Parts of your body don’t do that so as parts of Christ’s body-you shouldn’t do that either!