Psalms 66:18. Whenever we pray to God, we pray with the confidence that He exists and is paying attention and listening to our prayers. In order for us to pray with any conviction, we must believe that prayer does make a difference because it does. Although we trust God and pray to Him, sometimes we may feel like our prayers are not being heard and are not as effective as they should be. Is there a time when God will not listen to our prayers and answer them? According to David, there is. In one of his psalms, he writes that he cried out to God, and if he had not confessed the sins in his heart, God would not have listened to his prayers. When we have unconfessed sin, especially sins that we are aware we have committed, that sin separates us from God and breaks our fellowship with Him. When we refuse or neglect to confess and repent of our sins, our prayers will not be as effective or powerful as they should be because we are disobeying God which causes Him to not listen to our prayers. When we confess our sins, God forgives us and restores fellowship with us which includes listening to our prayers and answering them in His way on His time. If you feel that God is not listening to your prayers or that your prayers are not as effective as they should be, evaluate yourself for any unconfessed sin and confess and repent from them. Unconfessed sin is one of the biggest threats to having a powerful and effective prayer life in communication with God.