“Though good works are important in the Christian life, when it comes to justification, good works are good for nothing. For good works don’t bleed, and without the shedding of blood there is no forgiveness of sins.” ~Graeme Goldsworthy
My guess is that we will have to remember our sinfulness in heaven, because we will forever be dependent on Christ for our justification before a holy God.
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"To doubt God's mercy because our faith is feeble, is rather to rely upon our faith than upon the Lord. It is not the excellency and great measure of faith that makes us righteous before God, but Christ whom faith does receive and apprehend: which a weak faith can do as well as the strongest." ~John Ball (Puritan)