404. Verse 18. And unto Enoch was born Irad; and Irad begat Mehujael, and Mehujael begat Methusael, and Methusael begat Lamech. All these names signify heresies derived from the first, which was called "Cain;" but as there is nothing extant respecting them, except the names, it is unnecessary to say anything about them. Something might be gathered from the derivations of the names; for example, "Irad" means that he "descends from a city" thus from the heresy called "Enoch" and so on.