1 Timothy 6:6 NKJV - "Now godliness with contentment is great gain."
Godliness - The very character of God expressed through the lives of His children. This fits in with our being "conformed to the image of Christ." Romans 8:29. This is God's plan to fulfill His desire to fill up this earth with those who bear His image and will bring Him glory.
Contentment - the graceful acceptance of whatever God allows in my life, without complaint or pride. As Paul said in Philippians 4, he accepted the "wants" and "abundance" that God permitted in his life. He could be content whether he had a lot or a little.
This is considered a treasure of "great gain!" More than riches, fame, prestige, or pleasure, the Christian is blessed when they live godly, contented lives for the glory of Christ.