The central message of this sermon is that faith affirms the future in light of the past, based on the promise and performance of God. The speaker argues that people tend to worry about the future, but faith looks back at the promises and actions of God in the past to give confidence for what lies ahead. This perspective is illustrated through the lives of Isaac and Jacob, who, as they approached death, spoke truthfully and confidently about their futures, affirming God's plan despite uncertainty and unexpected twists. The speaker emphasizes that faith recognizes God's sovereignty and purposes are different from human plans and expectations, and that it is not about boasting in human power or provision but trusting in God's ways and thoughts. Ultimately, the sermon encourages listeners to understand that faith is about claiming a firm future based on God's promise and performance, even when circumstances seem uncertain or unpredictable.