These are two very difficult verses, which should perhaps, be rendered as follows: —
For did He not make [man and his wife, Genesis 2:24] one? and has he [the husband] any superiority of spirit [that he should divorce at will]? And what is this [pair which is become] one? [Answer.] It seeketh a godly seed. Therefore take heed to yourselves [literally, your spirit], and with respect to the wife of thy youth — Let none be faithless.