An antonym to unwise sayings would be wise or prudent sayings.
View page
Sayings can originate pretty much anywhere.
View page
A collection of sayings is called a "proverb" or "aphorism."
View page
There isn't a song with the title "Cute Sayings". However, there
are many songs that have cute sayings. For example, "You are
precious and I love you".
View page
His sayings are: "Whoa, didn't see that coming" and "Too the
lab!"