"Hast good authority" is a phrase that originates from older forms of English and its meaning can be ascertained by breaking down the individual words. "Hast" is the archaic second person singular form of the verb "have," indicating possession or ownership. "Good" denotes something that is acceptable, satisfactory, or of high quality. "Authority" refers to the power or right to give orders, make decisions, or enforce rules.
When used together, "hast good authority" implies possessing a reliable or credible source of information or knowledge. It suggests that the person or entity in question has the appropriate qualifications, expertise, or experience to speak or act with certainty on a particular matter. It carries the connotation that the information or directive given can be trusted and is backed by a respected or valid source.
This phrase is often used in contexts where assurance or endorsement is required, such as legal or professional settings. It can be used to confer credibility to a statement, opinion, advice, or the origin of information. For instance, if someone were to say, "I hast good authority that this product is of excellent quality," it means that they have reliable information from a trustworthy source about the product's superiority.
In conclusion, "hast good authority" suggests having dependable evidence, endorsement, or validation pertaining to a specific matter, indicating a level of trustworthiness in the information relayed or the source behind it.