Origen

“ But those who devote themselves to the divine word and have no other employment but the service of God may not unnaturally, allowing for the difference of occupation in the two cases, be called our levites and priests. And those who fulfil a more distinguished office than their kinsmen [2] will perhaps be high-priests, according to the order of Aaron, not that of Melchisedek. ”

“ Most of us devote most of our time to the things of this life, and dedicate to God only a few special acts, thus resembling those members of the tribes who had but few transactions with the priest, and discharged their religious duties with no great expense of time. ”