When the heart is set upon earthly success, pleasure, or comfort, then it cannot accept a denial without murmuring. The children of God should desire only God's glory, and in all other things themselves to his disposal. What is the the disposition of our hearts when our prayers are answered and God has given us the blessing we prayed for? We do not ask if for God's glory, if we do not use it for God's glory. If we consume his mercies on our lusts, or they do not encourage us to control our sins, it is a sign God's glory is not the desire of our hearts as it should be.
Thomas Manton, Works 1:73-74
taken from Voices from the Past: Puritan Devotional Readings, edited by Richard Rushing, Banner of Truth Trust