"The contentment of a man or woman who is rightly content does not come so much from outward arguments or from any outward help, as from the disposition of their own hearts. The disposition of their own hearts causes and brings forth this gracious contentment rather than any external thing.
Let me explain myself. Someone is disturbed... If you come and bring some great thing to please them, perhaps it will quiet them and they will be contented. It is the thing you bring that quiets them, not the disposition of their own spirits, not any good temper in their own hearts, but the external thing you bring them. But when a Christian is content in the right way, the quiet comes more from the temper and disposition of his own heart than from any external argument or from the possession of anything in the world.
I would unfold this further to you with this simile: to be content as a result of some external thing is like warming a man's clothes by the fire. But to be content through an inward disposition of the soul is like the warmth that a man's clothes have from the natural heat of the body. A man who is healthy in body puts on his clothes, and perhaps at first on a cold morning they feel cold. But after he has had them on a little while they are warm. Now, how did they get warm? They were not near the fire? No, this came from the natural heat of his body. Now when a sickly man, the natural heat of whose body has deteriorated, puts on his clothes, they do not get hot after a long time. He must warm them by the fire, and even then they will soon be cold again.
This will illustrate the different contentment of men. Some are very gracious, and when an affliction comes on them, though at first it seems a little cold, after they have borne it a while, the very temper of their hearts makes their afflictions easy. They are quiet under it and do not complain of any discontent. But now there are others that have an affliction upon them and have not this good temper in their hearts. Their afflictions are very cold and troublesome to them. Maybe, if you bring some external arguments to bear upon them like the fire that warms the clothes, they will be quiet for a while. But alas, if they lack a gracious disposition in their own hearts, that warmth will not last long. The warmth of the fire, that is, a contentment that results merely from external arguments, will not last long but that which comes from the gracious temper of one's spirit will last. When it comes from the spirit of a man or woman - that is true contentment."
- Jeremiah Burroughs
The Rare Jewel of Christian Contentment