According to the teachings in Chapter 14, what distinguishes human birth from that of an animal, and what is its ultimate purpose?

Chapter 14 draws a sharp distinction between human and animal existence. It states that a person who knows nothing beyond food, sleep, fear, and procreation is essentially like an animal "without a tail and horns." The true greatness of human birth, as explained in this chapter, lies in its unique potential for spiritual achievement. Through a human life alone, one can achieve devotion to God, attain the four types of liberation, and realize the Self. The text posits that if one does not use this life to become spiritually meaningful, their birth is a "useless burden on the earth," implying that the ultimate purpose of being human is spiritual evolution.