We sinners DO have to acknowledge our sins.
*We also have to REPENT.
*Included in repentance, that is, the desire not to sin again, is the effort to NOT commit those sins again.
We AVOID the "near occasion of sin." We KNOW all to well the lacunae in our souls and we CAN avoid the people, places, events, movies, magazines, books, etc., that cause us to sin.
Without the effort to avoid the "near occasions of sins" our repentance is only lip service.
Absolutely, purgatory is a guarantee to heaven. It is the trip to heaven. A process to heaven. We have to act accordingly. I worked with one guy who argued about no purgatory as a born again christian. Because he trusted me he confided that he was cheating on his wife. Just amazing. We have to live the life. The mentality of this phony mental assent called " faith only " is demonic. Just amazing. We live the life too. We confess our sins too like The Apostle John tells us in 1John epistle/ letter.
Peace in Christ