Jeff Bezos gave an interview in 2001 and answered a question on stress. His point was that stress comes from ignoring things that you have some control over.
He describes how when he takes action—even a small thing like making a phone call or sending an email to set things in motion—his stress dissipates.
It’s awfully stoic of him. He’s focused on the things he can control, and subconsciously doesn’t get bogged down by things outside of his control.