David Ravenhill emphasizes the necessity of preparation for those called to the prophetic ministry, highlighting that God does not use anyone without first preparing them through trials and challenges. He draws parallels from the life of Elijah, who faced immense pressure and loneliness, to illustrate that the prophetic office is not glamorous but requires deep commitment and maturity. Ravenhill asserts that the church must embrace the five-fold ministry, including the prophetic, to fulfill God's purpose in this generation, and he encourages prayer for those in prophetic roles as they face significant opposition. He stresses the importance of counting the cost of discipleship and being willing to forsake everything for the call of God, as exemplified by Elisha's response to Elijah's mantle.