It’s God’s will for pastors to preach the gospel under the anointing of the Holy Spirit. This means sermons should be Christ-centered, based in Scripture, and meet the needs of the people. And, of course, they should always be convincing and compelling. It’s the job of a pastor to present the principles by which people can walk in step with God, exhibiting His love and extending His grace to everyone they meet.
Source: Spirit-Anointed Preaching – Part 2