To whom God would make known what is the riches of the glory of this mystery among the Gentiles; which is Christ in you, the hope of glory: – Colossians 1:27

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. Jesus is indeed all for us, all to us, all in 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. If a soul can perish relying with all its power upon the finished work of the Savior, then I shall perish; but if saving faith be an entire reliance upon Him whom God hath sent forth to be a propitiation for sin, then I can never perish until God’s word be broken. Can you not say that, dear brethren, and will it not yield you comfort? Have you anything else you could trust to? Have you one good work that you could rely upon? Is there a prayer you have ever offered, an emotion you have ever felt, that you would dare to use as a buttress, or as in some degree a prop, to your hope of salvation? I know you reply, “I have nothing, nothing, nothing, nothing; but Christ my Savior is all my salvation and all my desire, and I abhor the very idea of putting anything side by side with Him as a ground of my dependence before God.” ~ C.H. Spurgeon

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