Sometimes the ancients say it best

In whom was it possible for us, the lawless and ungodly, to be justified, except in the Son of God alone? O sweet exchange, O the incomprehensible work of God, O the unexpected blessings, that the sinfulness of many should be hidden in one righteous man, while the righteousness of one should justify many sinners!

-- Epistle to Diognetus 9.4-5