Your estate may be small but God can still bless you through it. It is not how much money we have that is important, but rather how much blessing. Discontent does one thing. It keeps us from enjoying what we have. A drop or two of vinegar will sour a whole glass of wine.
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. Remember the water outside the ship does not sink it, it is the water that gets inside it 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.