And this helps explain things---
It is
true that every
Christian receives
sanctifying grace which confers on him a
priesthood. Even as
Israel under the Old dispensation was to
God "a
priestly kingdom" (
Exodus 19:4-6), thus under the New, all
Christians are "a kingly
priesthood" (
1 Peter 2:9); but now as then the special and
sacramental priesthood strengthens and perfects the universal
priesthood (cf.
2 Corinthians 3:3, 6;
Romans 15:16).
CATHOLIC ENCYCLOPEDIA: Holy Orders
Here's the rest of the story---
Exodus 19:5-6 Now therefore,
if ye will obey my voice indeed, and keep my covenant,
then ye shall be a peculiar treasure unto me above all people: for all the earth [is] mine: And ye shall be unto me
a kingdom of priests, and an holy nation. These [are] the words which thou shalt speak unto the children of Israel.
And what happened?
Pentecost on Mt. Sinai. Sunday morning God spoke/wrote the 10 commandments.
And the people's reaction?
Ex. 20:18 And all the people saw the thunderings, and the lightnings, and the noise of the trumpet, and the mountain smoking: and when the people saw [it], they removed, and stood afar off.
v19 And they said unto Moses, Speak thou with us, and we will hear: but
let not God speak with us, lest we die.
They couldn't bear it. So, they said to Moses, be our mediator. Then what happened?
Ex. 28:1 And take thou unto thee Aaron thy brother, and his sons with him, from among the children of Israel, that he may minister unto me in the priest's office, [even] Aaron, Nadab and Abihu, Eleazar and Ithamar, Aaron's sons.
God makes one tribe the priests who act for them. From a nation of priests to a tribe of priests.
Today, however, if we hear His voice, we have come to Mt. Zion.
Heb. 12:22
But ye are come unto mount Sion, and unto the city of the living God, the heavenly Jerusalem, and to an innumerable company of angels,