Teaching that impacts is not head to head, but heart to heart.
The teacher has not taught until the student has learned.
It's a sin to bore people with the Bible.
The secret to concentration is elimination.
Succeeding in business and failing at home is a cop-out. For no success in the workplace will ever make up for failure at home.
There's an old saying that nothing good happens fast. I don't know if that's altogether true, but it does have some bearing on Bible study.