Sharing is something we teach to little kids, but in real life, we’re much busier keeping track of who’s up and who’s down in an endless status game.*
(Seth Godin)

Collaboration is a competition – of us against ourselves. Us being the group – versus ourselves alone. To get the best results, we need to push ourselves past the point of ourselves.**
(Hugh Macleod)

By definition, one path must narrow until only one can walk it, the other path must widen so that many are able to walk together.

In another place Seth Godin writes:

But the effective, just and important thing to do is to help the back of the line catch up.^

I imagine Karen Armstrong adding to the argument:

I was at once impressed by the phrase ‘make place for the other.”^^

(*From Seth Godin’s blog: Toward abundant systems.)
(**From gapingvoid’s blog: How to leverage the laws of nature to build better outcomes.)
(^From Seth Godin’s blog: The real law of averages.)
(^^From Karen Armstrong’s Twelve Steps to a Compassionate Life.)