You are hereUCG.org / Sermons / The Open Door The Open Door Given on Aug 25, 2012 by Mark Sappington Listen Downloads MP3 Audio (7.58 MB) Downloads The Open Door MP3 Audio (7.58 MB) × Sermon by UCG Houston local elder Mark Sappington. Successful businesses and successful people take advantage of open doors of opportunity because they are prepared to walk through those doors.