Here is a short post about marriage with which I whole-heartedly concur. We read this book in our Sunday School class in Tulsa and thought it worth keeping.
I would also add that this truth is applicable to life in general. The ladies at the shower on Sunday were asked to each share some bit of maternal wisdom, and there was a common theme that life is not perfect--not for us, not for our children. Those imperfections, even the pain and suffering that often accompanies them, are what God often uses as a means of sanctification in our lives, making us more like Him and more reliant on His grace. American Christianity indeed has a tendency to imply that God wants us to be happy and healthy, sometimes to the exclusion of the basic reality that God wants us to be holy. Holiness is, certainly, not necessarily opposite happiness and health--but it is often in the less happy and less healthy times that we learn true godliness.