What is the origin of the idiom "all one's geese are swans" and when to use it?

The phrase "all one's geese are swans" is an English proverb that dates back to at least the 17th century. Its exact origin is uncertain, but it reflects a common theme found in various cultures and languages, emphasizing the tendency of individuals to perceive or present things in an exaggeratedly positive light. It can be used in personal conversations, discussions about achievements or accomplishments, or even in literary or artistic critiques. This expression often arises when someone's perception or portrayal of reality appears unrealistic or excessively positive, disregarding any flaws or limitations.