In the arts of life main invents nothing; but in the arts of death he outdoes Nature herself, and produces by chemistry and machinery all the slaughter of plague, pestilence and famine. ... There is nothing in Man's industrial machinery but his greed and sloth: his heart is in his weapons.
Nobody ever got anything from God on the grounds that he deserved it. Haven fallen, man deserves only punishment and death. So if God answers prayer it's because God is good. From His goodness, His lovingkindness, His good-natured benevolence, God does it! That's the source of everything.