As I am sure you know, there is abundant evidence in the Old Testament for a special priesthood for the one tribe of Levi. Deuteronomy 18:1–8 is just one among many such passages. This special priesthood could not be held by just anyone. It was restricted to those who were called. The author of Hebrews speaks of this Old Covenant priesthood in these terms in Hebrews 5:1–4.
Christ’s priesthood fulfills and supersedes the Aaronic priesthood. The letter to the Hebrews makes that clear. The entire people of God plays a priestly role in interceding for the world before God. But the Catholic Church insists that a ministerial priesthood exists in the New Covenant structure of the Church. This priesthood is based on and flows from Christ’s own priesthood. A properly ordained priest of the Church shares in a heightened and special way in the priesthood of Christ because he offers to God the same sacrifice that Jesus offered to God the Father. Jesus offered himself as the sacrifice to atone for sin (cf. 1 John 4:10; Heb. 9:12, 14, 26), and the priest today offers Jesus Christ back to the Father as the atonement for our sins.
Do you agree that Christ called some men to be his special representatives, such as in Matthew 4:19, Luke 6:13, and John 15:16? Do you agree that these men are called apostles and they are the human foundation of the Church (cf. Eph. 2:20)?
Absolutely! I believe in Acts 13 where the Holy Ghost chose Barnabas and Saul (Paul) to be ordained to the priesthood. The Lord chose them. They showed forth wonderful power thereafter!