Discovery of this saying by John Muir at On Being's Tumblr site—
When we try to pick out anything by itself, we find it hitched to everything else in the Universe.
reminded me that long ago Leonardo da Vinci wrote
everything connects to everything else
I couldn't find my original citation; I suspect it was given one of Michael Gelb's books and I think a fuller citation is "Study the art of science and the science of art. Everything connects to everything else." This reference is to an article on da Vinci that Gelb published in the Australian GQ.