He teacheth ill who teacheth all.
Meaning: Overwhelming learners with everything prevents them from mastering anything truly valuable or useful.
Origin: Recorded in A Dictionary of English Proverbs and Proverbial Phrases, an undated collection published in London by Whittaker & Co. around 1880 and credited to Thomas Preston. Its earlier history hasn't been traced.
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From our idioms
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- lose one's cool — To become angry.
- lose one's temper — To become suddenly angry. To hold one's temper means to remain calm when irritated.