Niklaus Wirth

My being a teacher had a decisive influence on making language and systems as simple as possible so that in my teaching, I could concentrate on the essential issues of programming rather than on details of language and notation.

If you're a filmmaker, and every time you finish a film, you just naturally go, 'Oh, I could have done so much better,' that's not much fun, is it, really? You might as well go pick another profession if that really is how you derive satisfaction from it.