Maybe what you are looking for has become so well-used that it is treated
as a proverb or saying and is not thought of as a quotation from one
individual person, poem or other work
There are many dictionaries of such proverbs and sayings. Some of them
may give the origin or supposed origin
You can search the library catalogue for
these types of books by choosing a 'Class' search and entering the following
library class numbers:
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