It’s a dangerous thing not to have enough knowledge of what’s gone before. But it’s a dangerous thing to have too much knowledge of what other people have done. Pretty soon you can’t do anything because they say “that’s already been done”. And you say, “I can’t think of anything new I might as well just stop because everything I do I know where I got it and I know who did it.” And you can’t work, you can’t think like that.