On Rewards and Punishments (55-56)

And this same man was likewise a lawgiver; for a king must of necessity both command and forbid, and law is nothing else but a discourse which enjoins what is right and forbids what is not right; but since it is uncertain what is expedient in each separate case (for we often out of ignorance command what is not right to be done, and forbid what is right), it was very natural for him also to receive the gift of prophecy, in order to ensure him against stumbling; for a prophet is an interpreter, God from within prompting him what he ought to say; and with God nothing is blameable.

In the fourth place he received the high priesthood, by means of which he, prophesying in accordance with knowledge, worships the living God, and by which also he will bring before him in a propitiating manner, the thanksgivings of his subjects when they do well, and their prayers and supplications if at any time they are unfortunate; now since all these things belong to one class, they ought to be held together and united by mutual bonds, and to be perceived in the same man, since he who is deficient in any one of the four is imperfect in his authority, as he is consequently invested with but a crippled authority over the common interests.