Ephesians 5:31

‘For this reason will a man leave father and mother and will cleave to his wife, and the two shall become one flesh.’

This is cited from Genesis 2:24, also cited with approval by Jesus (Matthew 19:5) who added, ‘so that they are no more two but one flesh. What God therefore has joined together let not man put asunder’. In God’s eyes the man and woman become one. Yet they are still two individuals. The point is that their relationship is such that it is inviolable and the two should act and think as one.