Why does God answer prayer? Let's not imagine that it's because somebody was good. We Protestants think we don't believe in saints, but we do. We canonize them: we have Saint George Mueller, Saint C.H. Spurgeon, Saint D.L. Moody and Saint A.B. Simpson. We get the idea that God answered prayer for them because they were really good. They would deny that fervently if they were here.
Nobody ever got anything from God on the grounds that he deserved it. Having 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. The Attributes of God, pp. 46-47
"Thank You, God, that You are indeed good, You are faithful, You are gracious, You are full of lovingkindness and benevolence. Thank You that You do in fact answer prayer! Amen."