2 Kings 20:4-6

How delightful are those gracious answers of a most gracious God! not that there was any change in the divine mind, but that the Lord, having in his providence induced a state which, under grace, shall lead his people to pray, he prepares their minds by this for his fore-determined answers of mercy. And observe how the Lord exceeds in gift what Hezekiah asked in prayer. He desired but to be remembered. And the Lord not only spares him from the effect of this sickness, but adds fifteen years to his life. Hence I have often thought that the apostle Paul intended to encourage wrestling petitioners at a throne of grace to ask for somewhat more than the promise seems to hold forth, as if a believer could never get to the bottom of the promise, when he said, Now unto him that is able to do exceedingly abundantly above all that we ask or think. Philippians 3:20.