The central message of this sermon is that waiting for God's promises and plan can be a difficult and uncomfortable experience, but it is an essential part of the Christian life. The speaker argues that waiting is not just about passively waiting for something to happen, but rather it involves living in expectation of God's timing and purposes. He draws on the example of Simeon, who waited for the coming of Messiah, and notes that Christians are called to wait for Jesus' second coming as well. The speaker also highlights the importance of experiencing and living out the promises of God in our daily lives, rather than just waiting for some future event or reward. Overall, the sermon emphasizes the need for patience, trust, and obedience in waiting on God's plan and timing.