Who shall lay any thing to the charge of God’s elect? It is God that justifieth. – Romans 8:33

Christ is all and in all. – Colossians 3:11

Happy art thou, O child or God, that in all thy relationships to the Great Judge of all the earth, Christ is all in all to thee. Thou needest a mediator to stand between thee and God; Christ is that. Thou wantest a high Priest to present with His own sacrifice thy prayers and praises; Christ is that. Thou wantest a representative to stand at all times before God, an intercessor to plead for thee, one who shall be a daysman akin to thee and akin to God, who can put His hand upon both; Christ is that to thee. Whenever God looks upon thee in Christ, He sees in thee all that ought to be there. Did He look upon thee apart from Christ, He would see in thee nothing He could commend: but thou art “accepted in the Beloved.” Even the omniscient eye of God detects nothing for which to condemn the soul which is covered with the righteousness of Christ. “Who shall lay anything to the charge of God’s elect? It is God that justifieth.” Without spot, or wrinkle, or any such thing, is the entire church as seen in the person of Christ Jesus, her representative and head. Christ is all for us before the throne of God.

But, alas! we need some one to stand between us and our enemies. There is Satan; how shall I meet him? He will accuse me; Who shall plead my case? Christ is all in all for that. Whatever fiery darts Satan may shoot, Christ is the shield that can quench those darts. If Satan tempt me, Christ shall plead for me before the temptation comes. Whenever I have to contend with Satan, this is the weapon with which I should arm myself: If I reason with him, if I bring forward any strength of my own to oppose him, he may well say to me: “Jesus I know; but who art thou?” But if I bring Jesus into the conflict, and wield the merit of His blood, and the faithfulness of His promise, the destroying angel cannot overcome the sprinkled blood. We overcome through the blood of the Lamb. Christ Jesus is both shield and sword to us, armor and weapons of war. ~ C.H. Spurgeon

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