c. 1600, from French enthousiasme (16c.) and directly from Late Latin enthusiasmus, from Greek enthousiasmos “divine inspiration, enthusiasm (produced by certain kinds of music, etc.),” from enthousiazein “be inspired or possessed by a god, be rapt, be in ecstasy,” from entheos “divinely inspired, possessed by a god,” from en “in” (see en- (2)) + theos “god” (from PIE root *dhes-, forming words for religious concepts).
I have been lucky enough to be enthusiastic about a lot of things in my life. Writing, reading, bringing up our kids, playing my sax, riding fast bikes, climbing hills, speaking on stages, driving my trucks.
I am now becoming increasingly enthusiastic about just being. Not doing things, just being.