I've used this concept for marriage building for years! The idea that husband and wife need to move closer to God at the same rate so their marriage has a stable base. The closer the husband and wife are to God, the closer they are to each other!
"If you believe what you like in the gospels, and reject what you don't like, it's not the gospel you believe, but yourself." --Saint Augustine ~ The same can be said for Catholic doctrine--it's not a buffet.