I think we all are doing that, and that is judging one another. People needs correction, but not to be judge for their mistakes. The Catholics does believe that Purgatory is of a physical nature is because they are perceiving the word like almost every other Christians are doing, and that is of the physical nature. Yes, we condemned the Catholics because their sight is poor, like ours; but eventhough, we claim that we can see. Purgatory is a period in our life that we all must goes through for the finishing touch before we move on to the next stage; and that is letting the devil to see if you can curse God. But Jesus said no one can't snatch none of His from out of his hands. So let the devil try, because he is unaware that what he is doing is strengthening us from wanting not to sin anymore. So he is purging us from sin, like he has purge Job.