"Let yourselves be built into a spiritual house to be a holy priesthood to offer spiritual sacrifices acceptable to God through Jesus Christ."
By virtue of baptism, all the faithful are true priests in Jesus Christ. The baptized Christian offers the spiritual sacrifice of his life - most especially in the Mass, but also throughout his whole life in obedience to the commandments.
The ministerial priesthood of the ordained is different not merely in degree but in kind - it is not a matter of more or less, but the ordained ministry is at the service of the baptismal priesthood. This is why there is no inequality or unfairness in that Jesus restricted ordination to the priesthood to men.
The three degrees of Holy Orders are bishop, priest and deacon - the deacon assists in the Mass, the priest celebrates the Mass, but the bishop has the power to ordain men as priests to give them the power to celebrate the Mass.
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