You're probably well aware that numerous scientific studies support the relationship between the mind/emotions and physical health. There are studies that support the relationship between prayer and healing. Also, there is the placebo effect, and its opposite, the nocebo effect, in which negative thinking actually makes you more sick! In one study, 2/3 of the participants reported experiencing the side effects they were warned about, yet they were only given sugar tablets. In other words, they reported feeling bad, when there was absolutely no physical reason for them to do so. Here's some information on the nocebo effect.
This is from a brief except from a Washington Post article by Brian Reid:
So, your thoughts, negative or positive, have a definite impact on your health. Could not the same be true for your finances? Think about it.