2 Chronicles 7:14

And My people, who are called by My Name, humble themselves, and pray and seek (crave, require as a necessity) My face and turn from their wicked ways, then I will hear (them) from heaven, and forgive their sin and heal their land. 

Sin blocks God from hearing our prayers. When we concentrate on the excesses of the world that satisfy the flesh and leave our souls empty, sin will prevail. If we repent and turn from our wicked ways, God will hear us, reach down from heaven, forgive our sins, and heal our land. But first, we must humble ourselves and seek and pray for God’s presence!