Philo: Who is the Heir of Divine Things?

XIX. (94) And it is well added in the scripture, "And it was counted to him for righteousness:" for nothing is so righteous as to have an unalloyed and entire belief in the only God. (95) But this, although both just and consistent with reason, was considered an incredible thing on account of the incredulity of the generality of men, whom the holy scripture condemns, saying, that "to anchor firmly and unchangeably on the only living God, is a thing to be admired among men, who have no possession of true unmingled good, but is not to be wondered at if truth guide the judgment; but it is the especial attribute of justice.