What does Hebrews 7:18 mean?
The system of the Old Testament priesthood, according to the author of Hebrews, is fundamentally flawed. Later verses will give specific reasons for this, such as the inherent sinfulness of human priests (Hebrews 7:27), their mortal nature (Hebrews 7:23), and their flesh-based inheritance of their titles (Hebrews 7:20). At the same time, this flaw is not an error in God's plan; rather, the priests of the law of Moses were never meant to be the final means of man's salvation (Hebrews 7:28—8:2).This is why the author presents the situation as God "setting aside" one commandment while introducing another (Hebrews 7:19). This does not mean God is changing or contradicting Himself. This was the purpose from the beginning, and all of the Old Testament laws were meant to point to this very person: Jesus Christ (Galatians 3:19—4:7). The law was meant to show us the way, not to be the final means of our salvation. Jesus, on the other hand, is the promise which does not have the weaknesses and limitations of the Levitical priesthood.