Thus Jesus takes a firm stand on the permanence of marriage in the original will of God. This corresponds closely with the position of the Pharisee school of thought led by Shammai, at the start of the first millennium, with which Jesus would have been familiar. By contrast, Rabbinic Judaism subsequently took the opposite view, espoused by Hillel, the leader of the other major Pharisee school of thought at the time; in Hillel's view, men were allowed to divorce their wives for any reason. Some hold that marriage vows are unbreakable, so that even in the distressing circumstances in which a couple separates, they are still married from God's point of view. This is the Roman Catholic church's position, although occasionally the church will declare a marriage to be “null” (in other words, it never really was a marriage). William Barclay (1907-1978) has written: Jesus brought together two passages from Genesis, reinforcing the basic position on marriage found in Jewish scripture. Thus, he implicitly emphasized that it is God-made ("God has joined together"), "male and female," lifelong ("let no one separate"), and monogamous ("a man…his wife"). Jesus used the image of marriage and the family to teach the basics about the Kingdom of God. He inaugurated his ministry by blessing the wedding feast at Cana. In the Sermon on the Mount he set forth a new commandment concerning marriage, teaching that lustful looking constitutes adultery. He also superseded a Mosaic Law allowing divorce with his teaching that "…anyone who divorces his wife, except for sexual immorality (Gk. "porneia"), causes her to become an adulteress, and anyone who marries the divorced woman commits adultery". Similar Pauline teachings are found in . The exception clause—"except for…"—uses the Greek word "porneia" which is variously translated "fornication" (KJV), "marital unfaithfulness" (NIV 1984), "sexual immorality" (NIV 2011), "unchastity" (RSV), "et al". "The KJV New Testament Greek Lexicon, KJV" says "porneia" includes a variety of sexual "deviations" to include "illicit sexual intercourse, adultery, fornication, homosexuality, lesbianism, intercourse with animals, etc., sexual intercourse with close relatives…." Theologian Frank Stagg says that manuscripts disagree as to the presence in the original text of the phrase "except for fornication".