After presenting in the first ten chapters a thorough comparison of Judaism and God's economy, this book charges the Hebrew believers, who were in danger of shrinking back, to live, to walk, to go on, by faith (Heb. 10:38-39), that is, not by appearance (2 Cor. 5:7). Then, in ch. 11 it goes on to define faith according to the history of faith. Both the eternal inheritance (Heb. 9:15) and the great reward (Heb. 10:35) promised by God are things hoped for and things not seen. Faith is the substantiation of things hoped for. Hence, it is the assurance, the confidence, the confirmation, the reality, the essence, the supporting ground, of things hoped for, the foundation that supports the things hoped for. Faith is also the conviction of things not seen. It convinces us of what we do not see. Hence, it is the evidence, the proof, of things not seen.