Wishful thinking is basically ego-prompted ~ you imagine things turning out well to feed your ego. One the other hand, when you imagine things going bad, you start to worry because you realize that things may go against your wish. In any case, one free of ego does not imagine things in one way or another. The entire focus is on following the Lord single-mindedly. Jesus is our perfect example. When he was on earth, he did not imagine nor worry about things ~ he was the most realistic person. Wishful thinking indicates the presence of ego and the lack of inner peace.