Change from within any community (or organization) is hard. Change from within one's self is often harder.
It seems we most demand of others that which we will not ask of ourselves. If we're honest, many of us reprimand the communities of which we're part for knowing what we ought - and not doing it - while at the same time failing to significantly address the need for said change in our own lives.
True, there is a place for those who point the way, but more often than not, this kind of "showing the way" is only made possible thanks to the well-worn path others have laid on their own in the first place.
Understanding that "B" is a better reality than "A" isn't the hard part - it's covering the ground between the two where we get hung up.
This is not a new argument (and Gandhi put it much more succinctly when he inspired/admonished us to "be the change we want to see in the world"), but I think it bears repeating.
If not only to remind myself.