Schools can be the Very Gates of Hell

Among a series of great quotations on Scripture from Martin Luther (found here) was this stirring one on education:

"I am afraid that the schools will prove the very gates of hell, unless they diligently labour in explaining the Holy Scriptures, and engraving them on the hearts of youth. I would advise no one to send his child where the Holy Scriptures are not supreme. Every institution in which men and women are not unceasingly occupied with the Word of God must be corrupt.”