…there is a difference between being convinced and being stubborn. I’m not certain what the difference is, but I do know that if you butt your head against a stone wall long enough, at some point you realize the wall is stone and that your head is flesh and blood.
Maya Angelou
Maya Angelou (b. 1928), U.S. author and performer. As quoted in Reel Women, part 4, by Ally Acker (1991).
Said in 1979, on giving up her attempt to be named director of the television version of the first volume of her autobiography, I Know Why the Caged Bird Sings.