Dr. Sharma exposes the deep, emotional stubbornness of a person with Ketu in the 4th house.
The 4th house rules the heart and inner emotions. Because Ketu is a "headless" planet, it operates purely on instinct and deep-seated karmic urges rather than logic.
When Ketu sits in the house of the heart, the person becomes emotionally deaf to the outside world. Dr. Sharma notes that they will *only* listen to their own feelings and desires ("hamesha dil ki hi sunta hai"). No matter how logical or beneficial the advice of others might be, they will completely ignore it ("logon ki kahi ansuni karta hai"), often leading to their own downfall.