2 Chronicles 6:21

So Listen to the requests of Your servant and Your people Israel when they pray toward this place. Hear from your dwelling place, from heaven, and when You hear, forgive.  Our unforgiveness or unconfessed sins can hinder our prayer. God is blocked from working on our behalf when we let sin stop our prayers. When we quickly confess our sins, we remove any hindrances to answered prayer. We are to judge ourselves and acknowledge when we know we have erred from the word of God