In this sermon, the speaker emphasizes the idea that as believers, we have a choice to make each day. We are not capable of making someone spiritual or taking them to heaven, but we can show them the way. The speaker highlights the concept of being a new person in Christ and not feeding the desires of our old flesh. He uses the analogy of two dogs inside our hearts, one black and one white, and explains that the outcome of the battle between them depends on which dog we choose to feed. The sermon also references the tabernacle and its significance in representing salvation and the different parts of our relationship with God.