423. Tubal-Cain is called the “instructor of every artificer” and not the “father” as was the case with Jabal and Jubal; and the reason is that before there were no celestial and spiritual or internal things. And the term “father” is applied to Jabal and Jubal, to denote that such internal things then first began to exist; whereas natural or external things did exist before, but were now applied to internal things, so that Tubal-Cain is not called the “father” but the “instructor, of every artificer.”