Guru teen mein kabhi kisi se na darna, itna sa parhez rakhna bewajah bahas na karna.
With Jupiter in the 3rd, never fear anyone; just keep this much precaution: do not argue unnecessarily.
The 3rd house is the house of courage, communication, and siblings. It is the natural house of Mars. Jupiter (Guru) is the planet of wisdom and expansion.
When Jupiter sits in the 3rd house, it expands the person's courage. They become absolutely fearless ("kabhi kisi se na darna"). Because they possess deep knowledge (Jupiter) and aggressive communication (3rd house), they can destroy anyone in a debate.
But Lal Kitab gives a strict warning: Do not argue unnecessarily.
If this person uses their wisdom to constantly argue, prove others wrong, or show off their intelligence, they will exhaust their Jupiter's positive energy. They will win the argument but lose their peace of mind and their friends.