The 12th house is the house of loss, isolation, and the subconscious. It is often considered a dark house.
However, Dr. Rishi Rohit Sharma explains the immense spiritual power of Jupiter (Brihaspati) in the 12th house. Even in the darkest moments of life, a strong Jupiter here acts like a single, powerful ray of light ("kiran andhere ko cheer deti hai") that guides the soul.
When this Jupiter is highly positive ("uttam"), it detaches the person from material greed. It elevates them to the spiritual status of a "Faqeer" (a detached saint or mystic). They may live in the material world, but their soul is completely free, peaceful, and illuminated by divine wisdom.