“Within this Christian vision for marriage, here's what it means to fall in love. It is to look at another person and get a glimpse of the person God is creating, and to say, "I see who God is making you, and it excites me! I want to be part of that. I want to partner with you and God in the journey you are taking to his throne. And when we get there, I will look at your magnificence and say, 'I always knew you could be like this. I got glimpses of it on earth, but now look at you!'"
Timothy Keller

Elisabeth George once wrote that if you are married you should read 5 min. a day on marriage. So here are some great books on the topic. 

Sacred Marriage by Gary Thomas

Reforming Marriage by Douglas Wilson

When Sinners Say I Do by Dave Harvey

What Did You Expect?: Redeeming The Realities of Marriage by Paul Tripp

The Meaning of Marriage: Facing the Complexities of Commitment with the Wisdom of God by Tim Keller

Helper by Design by Elise Fitzpatrick

How To Act Right When your Spouse Acts Wrong by Leslie Vernick

Friends and Lovers: Cultivating Companionship and  by Joel Beeke

Fruitful Wife: Cultivating a Love only God can Produce by Hayley DiMarco

The Excellent Wife by Martha Peace