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

To say prayers, to go to church, to take the sacrament to observe Good Friday, these are the main reliances of many a religionist, and then if the coach sticks a little in a deeper rut than usual, they call in the help of the Lord Jesus and hope that He will put His shoulder to the wheel. They commonly say, “Well, we must do our best, then Christ will be our Savior, and God is very merciful.” They allow the blessed and all-sufficient work and sacrifice of the Savior to fill up their failures; and imagine that they are extremely humble in allowing so much as that. Jesus is to them a stopgap, and nothing more. I know not whether the condition of such people is one whit more desirable than that of those to whom Jesus is nothing at all, for this is a vile contempt and despising of Christ indeed, to think that He came to help you to save yourselves, to dream that He is a part Savior, and will divide the world; and honor of salvation with the sinner. Those who yoke the sinner and the Savior together as each doing a part rob Christ of all His glory; and this is robbery indeed, to pilfer from the bleeding Lamb of God the due reward of His agonies. “He trod the winepress alone, and of the people there was none with Him.” In the work of salvation Jesus stands alone. Salvation is of the Lord. If Christ is not all to you, He is nothing to you. He will never go into partnership as a part Savior of men. If He be something He must be everything, and if He be not everything, He is nothing to you.

Sinner, thou art the emptiness, and Christ the fullness; thou art the filthiness, and He the cleansing; thou art nothing, and He is all in all; and the sooner thou consent to this the better. Have done with saying, “I would come to the Savior if this, and if that,” for this quibbling will delude, delay, and destroy thee. Come as thou art, just now, even at this moment, for Christ is not almost all, but all in all. ~ C.H. Spurgeon

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