Nevertheless I have somewhat against thee, because thou hast left thy first love. Remember therefore from whence thou art fallen, and repent, and do the first works… – Revelation 2:4,5
When the door to heaven seems shut to me as a saint, I will get through it as a sinner, trusting in the precious blood of Jesus. Come and stand again, as though all your sins were on you still, at the cross’s foot, where still may be seen the dropping blood of the infinitely precious atonement. Savior, I trust Thee again: guilty, more guilty than I was before, a sinful child of God, I trust Thee: “wash me thoroughly from mine iniquities and purge me from my sin.” You will never have your graces revived, unless you go to the cross. Begin life again. The best air for a man to breathe when he is sickly is said to be that of his birthplace: it was at Calvary we were born; it is only at Calvary we can be restored when we are declining. Do the first works. As a sinner, repair to the Savior, and ask to be restored. Then, as a further means of health, search out the cause of your declension. Probably it was a neglect of private prayer. Where the disease began, there must the remedy be applied. Pray more earnestly, more frequently, more importunately. Or was it a neglect of hearing the word? Were you enticed by novelty or cleverness away from a really searching and instructive ministry? Go back, and feed on wholesome food again perhaps that may cure the disease. Or have you been too grasping after the world?
Where the mischief began, there apply the remedy. And oh, I urge upon you, and most of all upon myself, do not make excuses for yourselves; do not palliate your faults; do not say it must be so; do not compare yourselves among yourselves, or you will be unwise; but to the perfect image of Christ let your hearts aspire, to the ardor of your divine Redeemer, who loved not Himself, but loved you; to the intense fervor of His apostles, who laid themselves upon the altar of God for His sake, for Christ’s sake, and for yours. Aspire to this and may we as a church live near to God, and grow in grace, then shall the Lord add to us daily of such as shall be saved. ~ C.H. Spurgeon
https://www.blueletterbible.org/comm/spurgeon_charles/sermons/1011.cfm