This is the way of contentment. There are these circumstances that I am in, with many wants: I want this and the other comfort-well, how shall I come to be satisfied and content? A carnal heart thinks, I must have my wants made up or else it is impossible that I should be content. But a gracious heart says, ‘What is the duty of the circumstances God has put me into? Indeed, my circumstances have changed, I was not long since in a prosperous state, but God has changed my circumstances. The Lord has called me no more Naomi, but Marah. Now what am I to do? What can I think now are those duties that God requires of me in the circumstances that he has now put me into? Let me exert my strength to perform the duties of my present circumstances. Others spend their thoughts on things that disturb and disquiet them, and so they grow more and more discontented.
Let me spend my thoughts in thinking what my duty is. –Jeremiah Burroughs, The Rare Jewel of Christian Contentment