An artist is a man who digests his own subjective impressions and knows how to find a general objective meaning in them, and how to express them in a convincing form.
A fixed focal length lens imposes its point of view on you, and consequently you can learn to impose its point of view on the world. If you routinely photograph with a fixed focal length lens sooner or later you will not need to look through your camera to know what the lens will see - your eyes will know, your mind will know.