St. Paul says in the first reading that “the works of the flesh are obvious.” If so, then why does Jesus have to point out the sins of the scribes and Pharisees, whose sinfulness “are like unseen graves over which people unknowingly walk”? It’s not that Jesus is pronouncing “woe” upon people unaware that they have sins, the problem is these people think that their hidden sins are no big deal because of their outward practices and appearances.
As long as we are at ease with “immorality, impurity, licentiousness, idolatry, sorcery, hatreds, rivalry, jealousy, outbursts of fury, acts of selfishness, dissensions, factions, occasions of envy, drinking bouts, orgies, and the like,” in our lives we will not enter the Kingdom of God. Even if we do not end up in Hell because of them, we will certainly have to wait on the doorstep to Heaven in Purgatory until these sins are rooted out. Let us crush these sins in our lives like the cancers that they are.