God is love, the greatest of all Christian virtues is love, and love energized by God lasts forever.
What can be the most powerful aspect of a wife and mother's life on earth as she obeys God's calling for her life? God wants it to be her grace-energized love.
What does God say will last forever from all the endless and mostly unseen hours of work that being a wife and mother entail? All the deeds offered in obedience to the Lord produced by grace-energized-love.
In Titus 2:4 we find the key that produces eternal reward from every day of a grace-energized wife's marriage and a grace-energized mother's family. Paul explains that the key is love. The first calling of a wife and mother in God's Word is to be LOVE.
[Our] gifts, [and our] ministries, all one day will cease to exist because they will cease to have purpose or meaning. But our showing love [to our husbands and children], practicing [that] love, [and] living [ that] love now--are of utmost importance, more important than having any of the other virtues or gifts, because love is the link God gives us with His eternal Self[1][1].
God is love (I John 4:8), and everyone who is born of God loves (I John 4:7)—so the greatest of all the virtues, the one that will last forever, is love (I Corinthians 13:13).
The key to grace-energized lives, marriages, and families is love.