40. This is what the Arians say; and by this cunning argument they attempt to catch the more simple-minded. However if we read the divine Scriptures we shall find that plurality occurs rather amongst those things which are of a diverse and different substance, that is, ἑτερούσια. We have this set forth in the books of Solomon, in that passage in which he said: “There are three things impossible to understand, yea, a fourth which I know not, the track of an eagle in the air, the way of a serpent upon a rock, the path of a ship in the sea, and the way of a man in his youth.” Prov. xxx. 18, 19. An eagle and a ship and a serpent are not of one family and nature, but of a distinguishable and different substance, and yet they are three. On the testimony of Scripture, therefore, they learn that their arguments are against themselves.