He saw the fulness of time coming to a conclusion. He knew God's Word, discerned the times, and labored in travail for the season to change. He identified with the sins of God's people and interceded for God's promises to come to pass. He prayed with authority because He knew what God had promised. He was heard because he was righteous, because he prayed according to God's will, and because he used the persistence of true faith.
Spiritual warfare involves testimony, prayer, praise, preaching, prophecy and proclamation.
These are things we do with our words. We form weapons with our mouth. These words inspired by God become articles of war that defeat Satan and dislodge his influence. High praises are especially powerful as tools of war. Intercessory prayer, standing in the gap for others, is especially blessed of God.