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

Christ is all for us, the surety, the substitute in our stead to bear our guilt; “For the Lord hath laid on Him the iniquity of us all.” “The chastisement of our peace was upon Him.” “He hath made Him to be sin for us who knew no sin, that we might be made the righteousness of God in Him.” He is also the worker standing in our place to fulfill all righteousness for us. He is the end of the law for righteousness to every one that believeth. All that God requires us to be, Christ is for us. 

And this day He is all to us. We trust wholly in Him. I often question myself upon many Christian graces, but there is one thing I never can doubt about, and that is I know I have no other hope but in the blood and righteousness of Jesus Christ.

Christ is all in us, and so He is. Whatever there is in us that is not of Christ and the work of His Spirit, will have to come out of us, and blessed be the day in which it is ejected…Wood, hay, stubble, are quick building, but they are also quick burning; only that which belongs to “Christ formed in me the hope of glory,” will prove to be gold, silver, precious stones, this may seem slow building, but it will abide the fire. O Christian, pray much and labor much to have Christ in thee, for He is all that is worth having in thee. He is only the husk of a Christian who has not the precious kernel of Christ in his heart. Christ on the cross saves us by becoming Christ in the heart. ~ C.H. Spurgeon

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