That's a better response to Will's post than to the Donne quote. Donne only states that all humans influence each other's existence to some minimal degree, butterfly-effect-style (I would object, incidentally, that such influence may not always be desirable); it's Will that brings up the similarities between humans as his moral foundation.
Indeed. But my comment was a reply to Will's.
This is our monthly thread for collecting these little gems and pearls of wisdom, rationality-related quotes you've seen recently, or had stored in your quotesfile for ages, and which might be handy to link to in one of our discussions.