Contentment is freely submitting to and taking pleasure in God’s disposal. Submitting to God’s disposal- What is that? The word submit signifies nothing else but ‘to send under’. Thus in one who is discontent the heart will be unruly, and would even get above God so far as discontent prevails. But now comes the grace of contentment and sends it under, for to submit is to send under a thing. Now when the soul comes to see its own unruliness–is the hand of God bring an affliction and yet my heart is troubled and discontented–What, it says, will you be above God? Is this not God’s hand and must your will be regarded more than God’s? O under, under! get you under, O soul! Keep under! keep low! keep under God’s feet! You are under God’s feet, and keep under his feet! Keep under the authority of God, the sovereignty of God, the power that God has over you! To keep under, that is to submit.
Jeremiah Burroughs, The Rare Jewel of Christian Contentment