For years, my master had done his utmost to pollute my mind with foul images, and to destroy the pure principles inculcated by my grandmother, and the good mistress of my childhood.
If you're not failing every now and again, it's a sign you're not doing anything very innovative.
All good actors are very bright. You can't be stupid and a good actor. You may be inarticulate, you may not be highly educated, but all good actors are quick-witted, some of them dazzlingly so. All you do is guide them.