Share 'A Gandhi quote'

I have seen several versions of this quotation from Gandhi - e.g. “Be the change you desire.” “Be the change you want to see in the world.” “We must be the change we wish to see in the world.” “You must be the change you wish to see in the world.” “For the change you wish to see in the world, you must be the first to change.” Can anyone tell me the source of this quotation? E.S. Reddy