"Be who you are and say what you feel because those who mind don't matter and those who matter don't mind.” I had heard something akin to that before, but did not know it as being attributed to Dr. Seuss. And then I found this, which clearly is a Seussism.
"Today you are You, that is truer than true. There is no one alive who is Youer than You."
And that's all I have to say about that.