"When the glory of God is the treasure of our lives, we will not lay up treasures on earth, but spend them for the spread of his glory. We will not covet, but overflow with liberality. We will not crave the praise of men, but forget ourselves in praising God. We will not be mastered by sinful, sensual pleasures, but sever their root by the power of a superior promise. We will not nurse a wounded ego or cherish a grudge or nurture a vengeful spirit, but will hand over our cause to God and bless those who hate us. Every sin flows from the failure to treasure the glory of God above all things. Therefore one crucial, visible way to display the truth and value of the glory of God is by humble, sacrificial lives of service that flow only from the fountain of God’s all satisfying glory." —John Piper
Quote taken from a sermon titled Why Expositional Preaching is Particularly Glorifying to God you can download it here.