The following story illustrates how this power works:
Reema was abroad on holiday when diagnosed with a large cyst on top of her spleen, and was told that she would need to undergo an operation for removal of the spleen as well as the cyst otherwise complication could arise.
She was never the most positive thinker and was quite emotional with regards to such things and therefore being told about her diagnosis really played weakened her as a person. Her mind was occupied with negative thoughts and fears concerning the operation which in addition bought about unhappiness.
Upon returning home from her holiday, with the help of Param Pujya Dada Bhagwan knowledge on positive thinking and her determination put Param Pujya Dada Bhagwan principle of remaining positive into practice she remained strong and faced each of her negative thoughts with positivity. With this goal in mind Reema continued this up until her date of operation. The effects of her positive mind set were amazing as the doctors were able to remove the cyst without the need of removing the spleen, thereafter she was able to recover within a span of 3 days.
What we can learn from this is that not everyone is born thinking positive, however if one has the ability to remain positive then one can achieve anything without being affected by negativity and can even change the negative situation around to become positive.

Read more on: https://www.dadabhagwan.org/path-to-happiness/self-help/positive-thinking/

Author's Bio: 

Ambalal M. Patel was a civil contractor by profession. In June 1958, spontaneous Self-Realization occurred within Ambalal M. Patel. From this point on, Ambalal became a Gnani Purush, and the Lord that manifest within him became known as Dada Bhagwan. A Gnani Purush is One who has realized the Self and is able help others do the same. Param Pujya Dada Bhagwan used to go from town to town and country-to-country to give satsang (spiritual discourse) and impart the knowledge of the Self, as well as knowledge of harmonious worldly interactions to everyone who came to meet him. This spiritual science, known as Akram Vignan, is the step-less path to Self-realization.