A priest in the Old Testament spent his life in serving God, offering sacrifices in the tabernacle or temple and teaching the people. When the Word tells you that you, as a New Testament believer, are a priest, there is wonderful privilege involved. You have direct access to the throne room of heaven. But you also have the responsibility of living a life that is set apart to serving God. That doesn’t mean that every believer has to seek the foreign mission field or the ministry. But it does mean that the details of your life need to be directed to the glory and honor of your God. You are set apart to serve him.
“The contemplation of Christ’s greatness in verse 14 might lead people to have lofty ideas of Him as One who could not have any feeling for them; therefore the author goes on to assure them: ‘For. . . we have not a high priest that cannot be touched with the feeling of our infirmities. . . .’” (Geerhardus Vos, The Teaching of the Epistle to the Hebrews, p.102).
“The sinner who capitulates to the first solicitation to evil cannot claim to have felt the full power of temptation. It was otherwise with Jesus who experienced the anguish of temptation to an unimaginable degree, for his immaculate person was was subjected to the continuous assaults of the Tempter.” (Geoffrey B. Wilson, Hebrews A Digest of Reformed Comment, p. 58).
Quotes from the Reflection for Trinity Presbyterian Church of the Orthodox Presbyterian Church.