David Ravenhill emphasizes the importance of spiritual longevity over mere fervency in his sermon 'They Drank From the River, Died in the Wilderness, Part 1.' He reflects on the Israelites who experienced God's provision yet failed to reach their promised purpose, drawing parallels to the modern church's need for self-control and purpose. Ravenhill warns that drinking from the spiritual river does not guarantee success, urging believers to move from privilege to purpose. He highlights the necessity of discipline and self-control in the Christian race, reminding the congregation that it is not how one starts but how one finishes that matters.