In whom we have redemption through His blood, the forgiveness of sins, according to the riches of His grace… – Ephesians 1:7

This forgiveness of sins is enjoyed by us now. “In whom we have”-we have-“redemption through His blood, the forgiveness of sins, according to the riches of His grace.” I remember the astonishment with which I sat in a ministers’ meeting, and heard one, who professed to be a preacher of the gospel, assert that he did not think that any one of us could be sure that we were forgiven. I ventured at once to say that I was sure; and I was pleased, but by no means surprised, to find that others dared to say the same. I hope I have hundreds before me who enjoy the same assurance.

Brethren, if there be no consciousness of the forgiveness of sins possible, how can there be any rest for the conscience? Yet Jesus says, “Come unto Me, all ye that labor and are heavy laden, and I will give you rest.” What rest is possible to the condemned? Can you go to bed to-night with your sins unforgiven? Some of you may have the foolhardiness to do that, but I would not dare to do it. See where you are. Within a moment you may be dead. Within that moment you will be in hell, past all hope. In a single instant you may be eternally lost: can you endure the thought? Our breath has but to stop, or the heart to cease beating, and instantly life is over. How can you be at peace, while sin is unforgiven? Unless sin had made men mad, they would never rest till they were cleared from their sins. There cannot be any true rest without a consciousness of forgiveness. Yet that rest is promised; therefore, the present enjoyment of an assurance of forgiveness must be possible. ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/2207.cfm