We can say that true gratitude does not give rise to the debtor's ethic because it gives rise to faith in future grace. With true gratitude there is such a delight in the worth of God's past grace, that we are driven on to experience more and more of it in the future...it is done by transforming gratitude into faith as it turns from contemplating the pleasures of past grace and starts contemplating the promises of the future.
John PiperOne way to appreciate C.S. Lewis is to see how his Christian humility shaped his life and work.
John PiperWithout extended, concentrated prayer, the ministry of the Word withers. And when the ministry of the Word declines, faith (Rom. 10:17; Gal. 3:2, 5) and holiness (John 17:17) decline. Activity may continue, but life and power and fruitfulness fade away. Therefore, whatever opposes prayer opposes the whole work of ministry.
John PiperTo love God does not mean to meet His needs, but rather to delight in Him and to be captivated by His glorious power and grace, and to value Him above all other things on earth. All the rest of the commandments are the kinds of things that we will do from our hearts, if our hearts are truly delighted with and resting in the glory of God's grace.
John Piper