I know what it is like to stand helpless in the face of human need. I also know what it's like to pray a wimpy prayer because my level of faith is so low. I've heard people pray quiet prayers that seem to have all the authority of Heaven behind them and Satan runs for cover. I've also heard people raise their voice and shout out their prayers and I've had the sense that Satan just laughs at them. Jesus tells the disciples that they are powerless because they have not learned to pray.
Constancy is the fourth mark of intercessory prayer.
David prayed seven times a day and Daniel, three times a day. Godly people are not hit and miss in their practice of intercessory prayer. They are disciplined in their praying. Epaphras . . . . Importunity is evidence of passion in intercessory prayer.