How does God reveal Himself according to the sermon?

The sermon outlines how God communicated His truths to the patriarchs, including Jacob, without the written Scriptures as we have them today. Through divine inspiration, God revealed the concept of redeeming grace and the necessity of blood sacrifice long before the coming of Christ. The preacher emphasizes that the natural man cannot perceive these spiritual truths without God's initiative. This revelation is not reliant on human logic or intelligence but is a gracious gift from God that enables believers to understand the depths of their need for Christ as Savior.