This question may sound bizarre. It may even suggest something is wrong with the person asking it.
But, if you are asking it, i want to affirm nothing is wrong with you.
In any case, if we can consider a person not crazy to ask, “why there is One God ?”, he is surely not crazy to ask “Why there is One Wife ?”.
Before i start answering this, i also want to clear out what this answer is NOT going to be about - morality.
Morality studies the right or wrong behind an intention or an action. We are past that question here. To borrow the famous language of the United States Declaration of Independence - We hold this truth to be self evident that, it is good for a man to have only one wife.
So, what then is the answer we are pursuing here ? We are pursuing the meaning of it, the purpose behind this truth.
The simple answer is, like all good things in life, like all good choices a man can make1, it is an act of love.
If we can believe that life is all about growing in love, continously choosing not to be deceived by our self-regard, seeing outside of ourselves, experiencing the eternal reality, then we will be well on our way to appreciate the goodness of it.
To the point that, in those moments of grace, even our weak human wills, can truly desire - with all our hearts and minds - what God always desires.
The final act here is to show why desiring One Wife is an act of love. Because, it meets all the criteria of what makes anything true love 2.
Thank you for reading. Let me leave you with the following song,
More love, More power, More of You in my life. And I will worship You, With all of my heart, With all of my mind, With all of my strength, For You are my Lord.