It is Christ that died… who is even at the right hand of God, who also maketh intercession for us. – Romans 8:34

Wherefore He is able also to save them to the uttermost that come unto God by Him, seeing He ever liveth to make intercession for them. – Hebrews 7:25

Suppose Satan should come to anyone who is seeking the Saviour, and say, “You will never find the Lord; you have sinned beyond all limit; you are too far gone for mercy to reach you; you must perish;” it will be your highest wisdom to give him this one reply, “It is Christ that died.” That short sentence completely answers to all his accusations. There is no terror to him like the terror of the cross. He gloated over the crucifixion once, and he has been distressed and terrified by it ever since. Tell him that you are a sinner, and that if he should paint your sin in its blackest colours, you would not even then despair, for it would still be true that Christ “is able also to save them to the uttermost that come unto God by Him.” Christ has died, and there is more than enough virtue in His death to atone for the blackest or most crimson sins ever committed by men. Close beside the bottomless pit of our iniquity stands the cross whereon Christ has made recompense for all our faults; and when we set Christ over against the gulf of our sin, we see that He far transcends it. Sin is great, but Christ is greater. His precious blood takes away every stain of guilt. Take care that you do not answer Satan with any other argument than this: “It is Christ that died.” Again and again let this blow, from the sword of the Spirit, descend upon him, “It is Christ that died,” and you will soon be acclaimed the victor over your greatest foe. In this way “Resist the devil, and he will flee from you.” “Who is he that condemneth?”

“Who now accuseth them,
For whom their Ransom died?
Who now shall those condemn
Whom God hath justified?
Captivity is captive led;
For Jesus liveth, who was dead.”

~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2240.cfm