Do We Have Clean Hands When we Pray for Revival?

The Lewis Awakening in 1949 began in a prayer burden

I believe this gracious movement of the Holy Spirit - The Lewis Awakening in 1949 - began in a prayer burden; indeed there is no doubt about that. It began in a small group who were really burdened. They entered into a covenant with God that they would "give Him no rest until He had made Jerusalem a praise in the earth". They waited. The months passed, and nothing happened, until one young man took up his Bible and read from Psalm 24: "Who shall stand in His holy place? He that hath clean hands and a pure heart… He shall receive the blessing from the Lord." The young man closed the Bible and, looking at his companions on their knees before God, he cried: "Brethren, it is just so much humbug to be waiting thus night after night, month after month, if we ourselves are not right with God. I must ask myself - "Is my heart pure? Are my hands clean?"

Duncan Campbell, quoted A.Wallis, In the Day of Thy Power