An idle hand is the devil's workshop...or something like that anyway.
Reminds me of a story:
When I moved to ATL in 03, I was mildly surprised to find that the weed dealer in the building next to mine also ran hos (large, pasty, midwestern hos, but hookers nonetheless). Kareem and I hit it off and he'd come over when he saw me pull up after work and we'd play video games and shoot the shit.
He says to me one day: "Man, this ho called me up today and said, 'Kareem, I was thinkin...'. I cut her off and said, 'Thinkin?? That means you wasn't workin!'. Wes, you got to keep these hos busy. Idle hands are the devil's workshop, you know."