I’m dreadfully sorry to you (and others who have sent similar messages to us about this), but the source of the quote is, most likely, utterly anonymous.
A great tool that we use for checking quotes is the website Quote Investigator. The specific article on this quote (and its many variations, as evidenced by the differences between the option you just quoted and the version we posted) can be found here: http://quoteinvestigator.com/2012/12/04/those-who-mind/.
A quick summary: a version of this quote had likely already entered public use by the late 1930s, to the extent that the quote was common enough to be referenced in professional writing. Original credit has variously been given to Sir Mark Young, Bernard M. Baruch, George Ludcke, and yes, Theodor Geisel, better known by the pseudonym of Dr. Seuss.
Unfortunately, Dr. Seuss is probably the least likely candidate for being the creator of this witticism, as it was not popular attributed to him until the early 21st century, and he himself passed away in 1991.
We have therefore made our post with the citation “Anonymous,” but tagged the post with “Dr Seuss” and “Bernard M Baruch,” two of the most popular false-citations for this quote, for organizational purposes and ease of search.