To 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 PiperThe greatest stumbling block for children in worship is that their parents do not cherish the hour. Children can feel the difference between duty and delight. Therefore, the first and most important job of a parent is to fall in love with the worship of God. You can't impart what you don't possess.
John PiperObedience does not consist in paying God back and thus turning grace into a trade. Obedience comes from trusting in God for more grace - future grace - and thus magnifying the infinite resources of God's love and power.
John PiperWe 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 Piper