What is your thoughts about purgatory?

If purgatory is a place the some people are sent to in order to purge themselves from their sins then does this nullify the work of Jesus Christ? Are we not saved by the grace of God through Jesus the Christ and his perfect work or are we saved by our transformation durning our time in purgatory, I think Not" .Read the 53rd chapter of the prophet Isaiah and answer this question. Atheist need not respond seeing how it will only prove your foolishness; the Fool has said in his heart there is no God.