Feynman-thoughts on simplicity:
You can recognize truth by its beauty and simplicity. When you get it right, it is obvious that it is right – at least if you have any experience – because usually what happens is that more comes out than goes in. Sympathetic Vibrations
When I found out that Santa Claus wasn’t real, I wasn’t upset; rather, I was relieved that there was a much simpler phenomenon to explain how so many children all over the world got presents on the same night! The story had been getting pretty complicated. It was getting out of hand. What Do You Care What Other People Think?
We can’t define anything precisely. If we attempt to, we get into that paralysis of thought that comes to philosophers… one saying to the other: “You don’t know what you are talking about!”. The second one says: “What do you mean by talking? What do you mean by you? What do you mean by know?” The Feynman Lectures on Physics, Vol. I, 8-2
Nature uses only the longest threads to weave her patterns, so that each small piece of her fabric reveals the organization of the entire tapestry. The Character of Physical Law