We are corrected on this earth or we are not corrected at all. In purgatory, those of us who have been judged worthy of heaven (made worthy is more accurate) will be cleansed from all attachment to sin. We may have venial sins that need purging. We may tend toward sin, even if we have not actually sinned. Look up the definition of concupiscence, as it explains everything bad in our nature; all of the evil we do, even though we still choose to do wrong. It is only via God’s grace that we overcome our fallen state of being. It is very deep theology and, if you ponder it, far more profound that then increasingly simplified “bible Christian” take on salvation.
An eternal reward cannot be that easy - but on the other hand, how can we merit it? Doing good works and having faith for a few short years does not equal eternal happiness - the reward greatly outweighs the cost. God’s grace stands in the gap, or else none of us would get to heaven.
He wants us to be with Him - but there are conditions placed upon us, or heaven would look much like hell!