“A man who uses his hands is a laborer. One who uses his hands and mind is a craftsman. He who uses his hands, and his mind, and his heart is an artist.”
… the only reference I’ve found attributes it to St. Francis, though I don’t find any support for that.
Anyone know who did say it?
Me.
Interesting.
If you google (with the quotes) “heart, is an artist”
The vast majority refer the quotation to St. Francis of Assisi,
but a minority attribute it to one Louis Nizer as in this example.
It was Nano. I remember distinctly.
Looking for St. Francis quotes didn’t bring it up, but looking for Nizer quotes did, and he is who “BrainyQuote” attributes it to. Seems more likely. Thanks for that!
Though, obviously, Nano is the one I must have heard it from first. 
Yes, I like to intone wise-sounding aphorisms. Wasn’t it Oscar Wilde who said, “Quotation is a serviceable substitute for wit.”? 
Anyway, just on idle speculation and nothing more, I’m betting on Nizer. The quote just doesn’t sound like something a deeply religious person would waste mind or breath on.
Nifty quote, Annie. And true.
Tom