“Why should neurotic, selfish, immature people suddenly become angels when they fall in love ... ?” - Denis de Rougemont
"Raw, natural talent does not enable you to play baseball as a pro or write great literature without enduring discipline and enormous work. Why would it be easy to live lovingly and well with another human being in light of what is profoundly wrong within our human nature?" - Timothy Keller
"The reason that marriage is so painful and yet wonderful is because it is a reflection of the Gospel, which is painful and wonderful at once. The Gospel is—we are more sinful and flawed in ourselves than we ever dared to believe, and at the very same time we are more loved and accepted in Jesus Christ than we ever dared hope. This is the only kind of relationship that will really transform us. Love without truth is sentimentality; it supports and affirms us but keeps us in denial about our flaws. Truth without love is harshness; it gives us information but in such a way that we cannot really hear it. God’s saving love in Christ, however, is marked by both radical truthfulness about who we are and yet also radical, unconditional commitment to us. The merciful commitment strengthens us to see the truth about ourselves and repent. The conviction and repentance moves us to cling to and rest in God’s mercy and grace." - Timothy Keller
These are some of the most beautiful truths I have read regarding marriage - you can find the entire article here.