For everyone who plants their flags in the authority of church history, here's a sweet little excerpt from chapter 9 of the Epistle to Diognetus. Then, for those who can be blessed by solid Great Awakening preaching, here a section from a George Whitfield sermon on Jer 23.6.
"He himself took on Him the burden of our iniquities, He gave His own Son as a ransom for us, the holy One for transgressors, the blameless One for the wicked, the righteous One for the unrighteous, the incorruptible One for the corruptible, the immortal One for them that are mortal. For what other thing was capable of covering our sins than His righteousness? By what other one was it possible that we, the wicked and ungodly, could be justified, than by the only Son of God? O sweet exchange! O unsearchable operation! O benefits surpassing all expectation! - that the wickedness of many should be hid in a single righteous One, and that the righteousness of One should justify many transgressors!"
"And you think, O sinners, that you will be able to stand in the day of judgment, if Christ be not your righteousness! No! That alone is the wedding-garment in which you must appear. O Christless sinners, I am distressed for you! The desires of my soul are enlarged! O that this may be an accepted time, that the Lord may be your righteousness! For whither would you flee, if death should find you naked? Indeed, there is no hiding yourselves from His presence. The pitiful fig leaves of your own righteousness will not cover your nakedness when God shall call you to stand before Him. Adam found them ineffectual, and so will you. O think of death! O think of judgment! Yet a little while and time shall be no more; and then what will become of you, if the Lord be not your righteousness."