In order to have peace certain condition must be met. These prerequisites to peace are Justice, Fairness, Equity, Equality, and fulfillment of mutual rights. Therefore any injustice whether it is oppression, or persecution, cannot be tolerated if there is to be peace in Muslim homes. Persecution is present when there is any form of domestic abuse being perpetrated. Tranquility on the other hand is a state of being which is achieved when peace has been established.
Tranquility is compromised when there is tension, stress and anger.
It is a mistake to take tranquility to mean perpetual state of bliss. Since being Muslims does not make us immune to tragedies and catastrophes. What a state of tranquility does is to empower us to handle life's difficult moments with our spouses as obedient servants of Allah. Allah in His infinite Mercy also provides us with the tools by which we can achieve this state of peace and tranquility. We are therefore inclined by our very nature to have mercy for our spouses.