Negative thoughts are more harmful than your worst enemy | Aaj Ka Vichaar

In Aaj Ka Vichaar, spiritual guru Pawan Sinha quotes Gautama Buddha. He is also known as Siddhārtha Gautama or simply the Buddha. He was a monk, mendicant, sage, philosopher and teacher on whose teachings Buddhism was founded. 

Gautam Buddha said, "Your worst enemy cannot harm you, as much as your own thoughts unguarded. But once mastered, no one can help you as much, not even your father or your mother. ."