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he teacheth ill who teacheth allused to imply that a teacher who claims to know everything and teaches beyond their expertise may be doing more harm than good
ProverbWhat is the origin of the proverb "he teaches ill who teaches all" and when to use it?
The origin of the proverb "he teaches ill who teaches all" is attributed to the 16th-century scholar and philosopher, John Lydgate, who was an English poet and monk. The saying is often used to suggest that a teacher who tries to cover everything, especially areas outside their expertise, may not be helping students. Instead of providing valuable knowledge, they might mislead or confuse them. It highlights the importance of knowing one’s limits as an educator and focusing on teaching what one truly understands, rather than attempting to teach every subject or concept.
