Here's what Pope Francis said in his homily about marriage:
The love of Christ, which has blessed and sanctified the union of husband and wife, is able to sustain their love and to renew it when, humanly speaking, it becomes lost, wounded or worn out. The love of Christ can restore to spouses the joy of journeying together. This is what marriage is all about: man and woman walking together, wherein the husband helps his wife to become ever more a woman, and wherein the woman has the task of helping her husband to become ever more a man. (Read more)
This is the task that you both share. “I love you, and for this love I help you to become ever more a woman”; “I love you, and for this love I help you to become ever more a man”. Here we see the reciprocity of differences. (Read more)
Here is a list of tips that Pope Francis has for marriage:
"Marriage is also a daily job. We could even say it's like craftsmanship. In a way it's like being a goldsmith, because a husband makes his wife more of a woman, and she in turn should make her husband a better man. Growing together in their humanity, as man and woman.”
But unlike any other job, marriage is a life long commitment. But this shouldn't scare couples, said the Pope. It's something they work on together, day by day. (Read more)
"The first setting in which faith enlightens the human city is the family. I think first and foremost of the stable union of man and woman in marriage. This union is born of their love, as a sign and presence of God’s own love, and of the acknowledgment and acceptance of the goodness of sexual differentiation, whereby spouses can become one flesh (cf. Gen 2:24) and are enabled to give birth to a new life, a manifestation of the Creator’s goodness, wisdom and loving plan. Grounded in this love, a man and a woman can promise each other mutual love in a gesture which engages their entire lives and mirrors many features of faith." - Pope Francis, Lumen Fidei
"Engagement, in other words, is the time when the two are called to perform a real labour of love, an involved and shared work that delves deep. Here they discover one another little by little, i.e. the man 'learns' about woman by learning about this woman, his fiancée; and the woman 'learns' about man by learning about this man, her fiancé. Let us not underestimate the importance of this learning: it is a beautiful endeavour, and love itself requires it, for it is not simply a matter of carefree happiness or enchanted emotion." - Pope Francis (27 May 2015)