You most likely know the story of Jacob stealing Esau's blessing from Isaac in Genesis 27. Jacob, the liar and deceiver, puts on clothing that belongs to someone else, takes stew that he did not make, and covers himself with skin that is not his, all so that he can have his father's blessing.
Does that perhaps ring a bell?
By the grace of God, we put on righteousness that was not our own, covered in the perfect blood of Jesus, and by His work alone and were able to approach the Father for His blessing. Unlike Isaac, God was not blind or deceived in pronouncing His blessing over us, but He knew that the sacrifice of His Son was enough to cover us and to impute all that belonged to Jesus onto us, as Jesus took all that we deserved as liars and deceivers upon Himself.
Amazing grace, how sweet the sound.