Matthew 6:22 The light of the body is the eye: if therefore thine eye be single, thy whole body shall be full of light.
Give up all things that scatter or multiply, or that hinder having a single eye. If the right hand offends, cut it off. Only do things that can be reduced to one thing. Multiples are of the world. The development of civilization (the world system) began with multiplying.
We are called to inner unity and the unity of the Body of Christ. If people stay in their personalities, they are in the realm of multiplicities. We must lose our life to find it.