Philo Judaeus De Posteritate Caini 100

And Jacob’s brother, he says, was Jubal, ¹ and the interpretation of this latter name is "inclining," being symbolically speech according to utterance; for this is naturally the brother of intellect; and it is with extraordinary propriety that he called the conversation of that intellect which changes affairs, "inclining," for it agrees after a fashion and harmonizes with both, as the equivalent weight does in a scale, or as a vessel which is tossed by the sea inclines first to one side and then to the other, from the violence of the waves; for the foolish man has not learnt how to say anything firm or stable. ^{2 3}