When I was 15, I was working three jobs during the summer. I had the overnight (graveyard) shift on the weekends at WZON/Z62 AM, I also held down a spot at the local record store, located in the Bangor Mall and helped out at WHSN, Husson College's radio station.
My mom would always tell me the I was going to 'work myself to death.' That was one of those phrases that I heard a lot over the years. Other phrases I've heard (and I'm sure you have too); 'A Penny For Your Thoughts,' 'A Bird In The Hand,' 'What Doesn't Kill You Makes You Stronger' and 'You'll Worry Yourself Sick.'