"He that is taught only by himself has a fool for a master"

This quote by Ben Jonson is a caution versus relying exclusively on one's own knowledge and experience. It suggests that without the assistance of an instructor or coach, one is likely to make mistakes and be misguided. It suggests that without the assistance of somebody more experienced, one is most likely to be their own worst opponent. The quote likewise indicates that without the assistance of another person, one is most likely to be stuck in a cycle of ignorance and foolishness. It is a reminder that understanding and knowledge come from gaining from others, which it is necessary to seek out the suggestions and assistance of those who have more experience. Ultimately, the quote is a pointer that it is very important to look for the assistance of others in order to acquire knowledge and knowledge.