Victoria Osteen transformed Joshua 24:15 into a call to serve positive thinking. Instead of a call to turn from the Devil, sin, and self, and turn toward God, she spritzed the Bible with the Osteen doctrine of positive thinking and ends up calling people to serve the idol of positive thinking. This "Christless Christianity" has no need for a Savior who redeems us, instead, it makes our determined and deliberate decision-making into another god.
The Osteens and Lakewood Church teach the Word of Faith false doctrine; please read more about it here:
Be sure to listen to all 4 videos of the White Horse Inn talking about Christless Christianity: