A man, after he has brushed off the dust and chips of his life, will have left only the hard, clean question: Was it good or was it evil? Have I done well - or ill?
A creative person has to be alive. He can't borrow from things he's done in the past. He can't let his method choose his subjects or his characters. They can't be warped to fit his style.
I don't think there is a single sentence in this whole book [East of Eden] that does not either develop character, carry on the story or provide necessary background.