"No man is so foolish but he may sometimes give another good counsel, and no man so wise that he may not easily err if he takes no other counsel than his own. He that is taught only by himself has a fool for a master"

This quote by Hunter S. Thompson is emphasizing the importance of seeking advice from others. Nobody is so smart that they can't make errors, and no one is so silly that they can't provide good recommendations. It is necessary to seek counsel from others, as relying exclusively on one's own judgement can lead to errors. Thompson is recommending that if one only listens to themselves, they are basically their own teacher, and therefore have a fool for a master. This quote is a tip that it is important to consult from others, as it can assist to prevent mistakes and offer valuable insight.