I learned the hard way that preparing to teach was work. Today, when I’m preparing a new lecture for a university class, I allow myself about three hours of prep for every one hour in the classroom. And this is for content that I’ve already studied in school myself.

The prep time is not necessarily spent re-learning the material, though that naturally happens too. Rather, the prep time is spent determining what to include, how to order the key points, and what examples will illustrate best.

Solomon did something similar.
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