God does not consider the sexual union of man and wife as cheap. To Him, it is so valuable that every time a person engages in it, he more intimately binds himself to his spouse.
The marriage union works to restore the the oneness of humanity; the man is incomplete without the woman, and the woman, without the man.
Despite having served mankind well for millennia, marriage is crumbling under a three-pronged attack. Marriage is vital to understanding God's purpose.
Becoming equipped for leadership requires that we discipline ourselves in following God's way of life, allowing the mind of Jesus Christ to be in us in.
Paul urges Euodia and Syntyche to follow the example of Christ rather than placing their desire to be right over unity. Godly leadership follows submission.