See The Possibilities...

Norman Vincent Peale might just have been the epitome of the "optimistic soul." One of my favorite Peale quotes is illustrated here:

The Book of Proverbs also speaks to the benefit of positive thinking: "The cheerful heart has a continual feast."
(Proverbs 15:15)

As Dr. Peale said, we weren't born with the worry habit; we acquired it.

Good point.