By Shauna Niequist That is why a man leaves his father and mother and is united to his wife, and they become one flesh. —Genesis 2:24 People refer to your wedding day as the best day of your life. I understand why entirely. I remember my wedding day so absolutely clearly. I remember putting on the veil, seeing Aaron’s face for the first time, the heaviness of my dress as I walked down the aisle with my dad. I remember the taste of the champagne and the sound of the band. I remember dancing with Aaron as though it was…