"For the Lord giveth wisdom: out of his mouth cometh knowledge and understanding." -Proverbs 2:6, KJV

True wisdom comes from God Himself. I teach at a Christian school, which resumes today, and it drives me nuts to hear about parents who will not put their kids in a Christian school because they don't want to shelter their kids from the "real world." The perfection of God's initial creation, the fall of man, and the salvation offered by His Word is the real world. God Himself gives wisdom. Yes, we can gain knowledge in secular learning, but wisdom can only be gained by a focus on God Himself.