Some are born great, some achieve greatness, and some have greatness thrust upon them
originated from altogether demotivational motives. It was actually intended to trick a silly character into believing himself greater than he really is. So, it wasn't quite meant as an inspirational slogan as one might initially think.
And
That that is is
Could this be the first recorded use of "It is what it is"? :)
Along with Much Ado About Nothing and A Midsummer Night’s Dream, Twelfth Night is among my favorite Shakespearean comedies. The characters are truly delightful. Well, except for Toby, who's a right bastard! I must admit, I have a partiality for the word "twelfth" because it contains "elf" in it.
Regarding adaptations: In the BBC audio version, Malvolio is the star role, superbly played by David Tennant, whose Scottish accent is like music to my ears. However, in the 1996 film, it's the fool, played by Ben Kingsley, who steals the entire show with his outstanding performance.