As the yogin advances in practice, the movements of the breath—whether flowing outward, inward, or held in suspension—are observed with careful attention to place, time, and number. Through this awareness, the breath gradually becomes prolonged and subtle. With persistent refinement, the practitioner enters a fourth kind of control, one that transcends engagement with both external and internal objects. At this stage, the covering that veils the inner light begins to diminish, allowing the radiance within to shine forth. The mind, purified and focused, becomes truly fit for concentration. The senses, following the mind’s lead, withdraw from their usual objects, as if they are imitating the mind’s inward turn and ceasing to be drawn outward. This withdrawal marks the arrival of supreme mastery over the senses. With the senses mastered, the yogin turns to concentration, binding the mind to a single point. When the mind flows uninterruptedly toward this chosen object, meditation arises. In the deepest state, only the object shines forth, and the sense of self recedes as if absent—this is samadhi. When concentration, meditation, and samadhi are practiced together on a single point, they form samyama. Through mastery of samyama, the light of true insight dawns. This profound application can be directed to various levels of experience. These three—concentration, meditation, and samadhi—are more internal than the earlier practices of restraint and sense withdrawal, yet even they are considered external when compared to the ultimate, seedless samadhi. Within the mind, the impressions of distraction and restraint alternate. When the mind is linked to the moment of restraint, this is called the transformation of restraint, and its flow becomes tranquil, leaving a peaceful impression. The fading and arising of the mind’s focus on objects, whether many or one, is known as the transformation of samadhi. When the impressions of tranquility and arising are balanced, the transformation of one-pointedness is attained. By understanding these transformations, the yogin perceives the changes of characteristics, marks, and states in the elements and the senses. The underlying substance of things follows these characteristics, whether tranquil, arising, or unmanifest. It is the difference in sequence that causes different transformations to occur. When samyama is performed on these three kinds of transformation, knowledge of the past and future arises. Confusion, caused by the mingling of sound, meaning, and mental impression, is dispelled by samyama on their separation, granting knowledge of the speech of all beings. By directly perceiving impressions, the yogin comes to know previous births. Focusing on the impressions in another’s mind, the thoughts of others are revealed—though not their deeper support, which remains hidden from perception. By practicing samyama on the form of the body, the yogin can suspend the power of being perceived, breaking the link between the eye and light, and thus become invisible. Applying samyama to karma, whether bearing fruit or not, brings knowledge of the time of death, or this knowledge may come through omens. Through samyama on qualities such as friendliness, compassion, and joy, corresponding powers arise. Focusing on strength, the yogin attains the might of an elephant or similar abilities. By directing the light of higher perception to activity, the subtle, hidden, and distant are revealed. By turning samyama to the sun, knowledge of the worlds is gained; to the moon, knowledge of the arrangement of the stars; to the pole star, knowledge of their movement. Focusing on the navel center brings understanding of the body’s structure, while samyama on the pit of the throat causes hunger and thirst to cease. Concentration on the tortoise channel bestows steadiness, and on the crown of the head, the vision of perfected beings arises. Alternatively, through spontaneous insight, knowledge of all things may arise. Finally, by samyama on the heart, the innermost knowledge of the mind itself is attained. Thus, the yogin’s journey unfolds, ever deeper into mastery, insight, and realization.