The barrier that keeps us from prayer is not whether or not we think God is strong enough to help us, but whether we are humble enough to bow the knee and admit that we need help.  Many of us, however, distance ourselves from God, wondering if He is really interested in us because of who we are.  Yes, we know our imperfections better than we know God's strength and compassion.  So we feed the nagging voice of doubt and withdraw into our cave of lonely isolation.