The document outlines the biblical plan of redemption through the sanctuary symbols of the Old Testament tabernacle. It describes three areas of the sanctuary - the courtyard, holy place, and most holy place - which represent justification, sanctification, and glorification. These correspond to Christ's sacrifice on the cross, his priestly ministry, and final judgment. Key symbols are explained, including the altar of burnt offering where sins were transferred to innocent lambs, representing Christ as the ultimate sacrifice for sins. The sanctuary system teaches about the process of salvation through visual symbols and types pointing to Jesus.