Kṛṣṇa uses a biological analogy to explain sense control. He compares the wise person to a tortoise that draws its limbs within its shell at the first sign of danger. Similarly, the yogī is able to withdraw his senses from their objects whenever necessary. The senses are like wild horses that naturally run toward their objects (sight toward beauty, tongue toward taste). The wise man has the strength to pull them back. He uses his senses when needed for duty, but he doesn’t let them roam freely into the territory of temptation. This ability to say “No” to one’s own eyes and ears is the mark of fixed intelligence. Most people are dragged around by their senses, but the yogī is the master of his house. Like the tortoise, he is protected by his own self-discipline, remaining safe within his spiritual integrity.