Dr. Sharma shares a brilliant, cautionary metaphor for Mercury (Buddh) in the 10th house.
The 10th house is the house of career, karma, and public reputation (ruled by Saturn). Mercury is the planet of intellect, speech, and cleverness. When Mercury sits here, the native is highly intelligent and often tries to use their sharp mind ("mashalein" or torches) to rapidly build their career and illuminate their life.
However, Dr. Sharma warns of the danger of over-cleverness. If the native becomes too manipulative, talks too much, or tries to outsmart the system, their own intellect becomes a destructive fire. Their clever schemes backfire, and they end up living in constant fear ("lagne laga darr") that their own actions will burn down the empire ("aashiyane") they tried to build.