Let the wicked forsake his way, and the unrighteous man his thoughts: and let him return unto the LORD, and He will have mercy upon him; and to our God, for He will abundantly pardon. – Isaiah 55:7

Pardon once given continues to be given. When through doubt and anxiety I was not sure of my pardon, yet it was still true; for he that believeth on Him is not condemned, even though he may write bitter things against himself. Beloved friend, catch hold of that, and do not let it go. Divine pardon is a continuous act.

And this forgiveness on God’s part was most free. We did nothing to obtain it by merit, and we brought nothing wherewith to purchase it. He forgave us for Christ’s sake, not for aught that we had done. True, we did repent, and did believe, but repentance and faith He gave us, so that He did not forgive us for the sake of them, but purely of His own dear love, because He delighteth in mercy, and is never more like Himself than when He passeth by transgression, iniquity, and sin.

Remember, also, that He forgave us fully. It was not here and there a sin that He blotted out, but the whole horrible list and catalogue of our offences He destroyed at once. The substitution of our Lord has finished that matter even to perfection:

“Because the sinless Saviour died,
My sinful soul is counted free;
For God, the Just, is satisfied
To look on Him and pardon me.”

~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1448.cfm