Sometimes contentment is a tough thing to have. But if we love our neighbor, we will not transgress in our thoughts against them. The very motions of our heart will seek his or her well being. Discontent does one thing. It keeps us from enjoying what we have.
Comfort depends upon contentment.
It is often the case that it is not the trouble that troubles, but the discontent that comes with the trouble. Apparently I am the only one in the United States that has not seen the movie Titanic, but I know this about ships, it is the water that gets inside that brings it down. So also it is not the outward afflictions that make life sad, because a contented mind sails above these stormy waters. But when there is a leak of discontent, and trouble gets into the heart, then the disquiet comes and the sinking begins. The discontented person thinks that everything he does for God is too much, and everything God does for him is too little.