Its been proven [that] if you walk with your head down, you are more likely to "think" or focus on issues & problems. But if you walk with your head up, you will be less likely to do so. Try it. See what happens when you pace looking down, and then see how you feel when you walk with your head up.
"You never know what... opportunity is awaiting you...you just have to keep your head up long enough to see it!"