That everybody can do something, without regard to how old or young they are, rich or poor or middle class they are, how busy or not busy they are and what level skills they have. Everyone can do something. And everybody should do something. . . . And if you do it, you'll be happier.
I think that it's workshops, honestly, that have kept me keen about photography, and about my photography. My career as a workshop photographer came while I was at the Geographic in the late 70's, and has continued consistently since then.