> Stress isn’t good or bad. It’s a tool. In small doses it’s good, but too much of a good thing becomes a bad thing pretty quickly.

Actually, I think this is a wrong rule of thumb. In my experience, there is more of a "barbell dynamics" (Taleb):

I can take a lot of stress at once, but then I need some time to recover. I find this perfectly healthy and it grows me as a human being. On the other hand, when I'm under constant stress with no relief in sight, that's the real killer.