“Christ is all in all.”-Colossians 3:11

The Apostle was arguing for holiness…Observe in this chapter that he begins by reminding the saints of their having risen with Christ. If they indeed have risen with Him, he argues that they should leave the grave of iniquity and the graveclothes of their sins behind, and act as those who are endowed with that superior life, which accounts sin to be death and corruption. He then goes on to declare that the believer’s life is in Christ, “for ye are dead, and your life is hidden with Christ in God.” He infers holiness from this also. Shall those who have Christ for their life defile themselves with guilt? Is it not inevitable that, if the Holy One of Israel be in them as their life, their life should be fraught with everything that is virtuous and good? And then he brings forward the third argument that in the Christian church Christ is the only distinguishing mark. In the new birth we are created in the image of Jesus, the second Adam, and in consequence all the distinctions that appertain to the old creation are rendered valueless; “there is neither Greek nor Jew, circumcision nor uncircumcision, Barbarian, Scythian, bond nor free: but Christ is all, and in all”: the argument from this fact being, that since the only abiding distinction in the new creation is Christ, we should take care that His image is most clearly stamped upon us so that we may not only confess with our tongues that we are Christians, but our conversation and our entire character shall bespeak us to be such. As you may recognize the Jew by his physiognomy, the Greek by his gracefulness, and the barbarian by his uncouthness; so should the Christian be known by his Christliness, by the light, love, and life of Christ streaming forth from him. This is the seal of God which is set upon the forehead of the faithful, and this is the mark of election which is in due season graven in the right hand of all the elect. ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/1006.cfm