This was Shakespeare's form; who walked in every path of human life, felt every passion; and to all mankind doth now, will ever, that experience yield which his own genius only could acquire.
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.