Indeed, marriage is a school, but it is the only school in the world where you are given your certificate from the beginning and you never really graduate!
“Give [instruction] to a wise [man], and he will be yet wiser: teach a just [man], and he will increase in learning.” – Proverbs 9: 9
“How much better [is it] to get wisdom than gold! and to get understanding rather to be chosen than silver!” – Proverbs 16: 16
“And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God.” – Romans 12: 2