I have begun my last semester of classes for my MA in Church Planting and Evangelism from Liberty University. One of the classes that I am taking is called Strategic Prayer and Spiritual Warfare. One of the required texts is Personal Prayer: The Timeless Secret of High-Impact Leaders. It is a great book, one worth reading. Anyway, as I was reading it, I came across this list about the importance of prayer in ministry.
Prayer is the way you defeat the devil (Luke 22:23; James 4:7).
Prayer is the way you get the lost saved (Luke 18:13).
Prayer is the way you acquire wisdom (James 1:5).
Prayer is the way a backslider gets restored (James 5:16-20).
Prayer is how saints get strengthened (Jude 1:20; Matthew 26:41).
Prayer is the way to get laborers out to the mission field (Matthew 9:38).
Prayer is how we cure the sick (James 5:13-15).
Prayer is how we accomplish the impossible (Mark 11:23-24).
David Jeremiah, Prayer, the Great Adventure (Sisters, OR: Multnomah Publishers, 1997), 40-41.
If you are interested, the books that were referenced above are available through Amazon.com.