Proverbs 23:7 - As a man thinketh in his heart, so he is.
Every unchecked, unchallenged thought has a destination. It leads to either right or wrong action. Sometimes, a thought builds momentum, collected over time, resulting in action to achieve a desired outcome.
Most idle thoughts begin with wondering. The what ifs of our mind are a mirage of an oasis in a vast desert. A temporary reprieve from how things are, a trip to nowhere. The what ifs of the past are even more dangerous. "What if: I said something different to that person; handled that situation another way; behaved in a certain manner..." Nothing changes.
Although we all have a secret thought life, it is evident in our actions, our relationships.
If you indulge in right living, right thought and action, reality might throw a curve ball at you. Just don't sit there expectant, hoping for things to go right while your mind entertains negative, self-depreciating thoughts.