Here is today's Rhyming Distich, and here are some more posts with Rhyming Distichs. I guess this is a proverb we could apply to teachers and textbooks, teachers and technology - the best technology in the hands of the worst instructor is not likely to result in good learning.
Sit bonus interpres, nil mala verba nocent;
Sit malus interpres, nil bona verba docent.
Here is the vocabulary:
sum - be, exist
bonus - good
interpres - interpreter, explainer
nil - nothing
malus - bad
verbum - word
noceo - injure, harm
doceo - teach