God intended people to come together to find a loving partner, who will help, love, and cherish one another. "It is not good for the man to be alone. I will make a helper suitable for him." This is man and woman being made to love each other. Marriage is a sacrament, which means that the wed couple receive God's love and grace within their relationship. Knowing that the marriage contains God, it helps them to reflect God's love, and to love each other like God loves us. Marriage is to be permanent, life giving, a sacrament, exclusive, public, and also has to reflect selfless love in the views of Catholics. .
The vows in the marriage reflect that it is a sacrament; this is because you are making an oath to your partner in front of God. "For better, for worse, for richer, for poorer, in sickness and in health, to love and to cherish," These vows help to reflect on how to live your marriage, and shows that they'd show agape (selfless love). Which reflects "wives should submit to their husbands in everything." This is another example of agape love within a catholic marriage. This will help the couple throughout their marriage because the vows remind you that God is within the relationship, and that gives a constant reminder that agape love must be reflected at all times, no matter the time or place. This type of love is important because you demonstrate your love to each other, knowing what they'd feel like if you were in their position, this type of love is important because it's less about yourself and more about the partner you love and cherish.
There are three questions asked by the priest during the marriage, "Have you come here freely to give yourselves to each other in marriage?" The priest asks this question so that the couple will get married at their own will and not by force, this is so that the priest can ensure that the marriage will be permanent, and will not end up in annulment or divorce.