To keep in mind while lesson planning

And further, by these, my son, be admonished: of making many books there is no end; and much study is a weariness of the flesh. Let us hear the conclusion of the whole matter: Fear God, and keep His commandments; for this is the whole duty of man. For God shall bring every work into judgment, with every secret thing, whether it be good, or whether it be evil. Ecclesiastes 12:12-14

In other words, do not neglect faith, and virtue, the one lesson of primary importance. For the fear of the Lord is the beginning of wisdom, and the wise man seeks out knowledge on his own; but a fool closes his heart to instruction, and the best curriculum and teaching in the world will not cause his heart to receive it.