Some of the key themes that Joel Osteen emphasizes in his sermons and writings include:

• The importance of having a positive attitude and a good outlook on life, which he believes is essential for overcoming life's challenges and achieving success.
• The power of faith and prayer in overcoming challenges and achieving success, which he believes is a key component of a successful and fulfilling life.
• The importance of forgiveness and letting go of negative emotions, which he believes is essential for moving forward and achieving happiness and peace.
• The need to focus on the present moment and live in the here and now, which he believes is essential for finding joy and fulfillment in life.
• The importance of being a good steward of one's resources and talents, which he believes is essential for making a positive impact on the world.