
“When one tugs at a single thing in nature, he finds it attached to the rest of the world.”
These are paraphrases of Muir's quote from My First Summer in the Sierra (1911) - the actual quote is listed above: "When we try to pick out anything by itself, we find it hitched to everything else in the Universe." See Sierra Club explanation http://www.sierraclub.org/john_muir_exhibit/writings/misquotes.aspx.
Misattributed
Variant: Tug on anything at all and you'll find it connected to everything else in the universe.
Variant: When we tug at a single thing in nature, we find it attached to the rest of the world.