Another reason for unanswered prayers.

​isaiah 59:1-2 – Behold, the Lord ‘s hand is not shortened, that it cannot save, or his ear dull, that it cannot hear; but your iniquities have made a separation between you and your God, and your sins have hidden his face from you so that he does not hear.

Psalm 66:18 – If I had cherished iniquity in my heart, the Lord would not have listened.