It's not just wishful thinking.
When you reach for positive thoughts, you tend to see the best in every situation. Your perspective shifts & you're open to opportunities that would otherwise be hidden by your negativity.
You also appreciate the good the stuff so much more.
It's a similar story with luck. People who believe they're lucky, aren't surprised when they get lucky. It's not luck so much as their positive perspective & thinking.
Your beliefs, definitions & the stores you tell yourself have a dramatic impact on your experience.