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It is clear to all of us that if we think we are rich we will not be richer in money. On the other hand we also know that if we think we can achieve something, we are more likely to achieve it than if we believe we cannot.
Faith changes our behavior and our behavior changes reality
Our belief will not change external factors. Effort to think that now is summer during winter time, is hopeless for any intelligent person.
But when it comes to our body and our behavior, faith has tremendous power.