…to them that have obtained like precious faith with us through the righteousness of God and our Saviour Jesus Christ… – 2 Peter 1:1

Be pleased to notice the word “righteousness.” It is a faith in the righteousness of our God and our Saviour. In these days, certain divines have tried to get rid of all idea of atonement; they have taught that faith in Jesus Christ would save men, apart from any faith in Him as a sacrifice. Ah, brethren, it does not say, “faith in the teaching of God our Saviour;” I do not find here that it is written, “faith in the character of God our Saviour, as our exemplar.” No, but “faith in the righteousness of God our Saviour.” That righteousness, like a white robe, must be cast around us. I have not received Jesus Christ at all, but I am an adversary and an enemy to Him, unless I have received Him as Jehovah Tsidkenu, the Lord our righteousness. There is His perfect life; that life was a life for me; it contains all the virtues, in it there is no spot; it keeps the law of God, and makes it honourable; my faith takes that righteousness of Jesus Christ, and it is cast about me, and I am then so beauteously, nay, so perfectly arrayed, that even the eye of God can see neither spot nor blemish in me. Have we, then, today a faith in the righteousness of God our Saviour? For no faith but this can ever bring the soul into a condition of acceptance before the Most High. ‘Why,” saith one, “these are the very simplicities of the gospel.” Beloved, I know they are, and thanks be to God, it is the simplicities which lie at the foundation; and it is rather by simplicities than by mysteries that a Christian is to try himself and to see whether he be in the faith or no. Put the question, brethren, have we, then, this like precious faith in God and our Saviour Jesus Christ? ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0551.cfm