the rising Sun-god, where it has been interpreted as "yoke" or "control". Pāṇini (4th c. BCE) wrote that the term yoga can be derived from either of two roots: yujir yoga (to yoke) or yuj samādhau ("to concentrate"). In the context of the Yoga Sutras, the root yuj samādhau (to concentrate) is considered the correct etymology by traditional commentators. In accordance with Pāṇini, Vyasa (who wrote the first commentary on the Yoga Sutras) says that yoga means samadhi (concentration). In the Yoga Sutras (2.1), kriyāyoga is yoga's "practical" aspect: the "union with the supreme" in the performance of everyday duties. A person who practices yoga, or follows the yoga philosophy with a high level of commitment, is called a yogi; a female yogi may also be known as a yogini. Definitions in classical texts The term yoga has been defined in different ways in Indian philosophical and religious traditions. {| class="wikitable" |+ !Source Text !Approx. Date !Definition of Yoga |- |Vaisesika sutra | c. 4th century BCE |"Pleasure and suffering arise as a result of the drawing together of the sense organs, the mind and objects. When that does not happen because the mind is in the self, there is no pleasure or suffering for one who is embodied. That is yoga" (5.2.15-16) |- |Katha Upanishad | last centuries BCE |"When the five senses, along with the mind, remain still and the intellect is not active, that is known as the highest state. They consider yoga to be firm restraint of the senses. Then one becomes un-distracted for yoga is the arising and the passing away" (6.10-11) |- |Bhagavad Gita | c. 2nd century BCE |"Be equal minded in both success and failure. Such equanimity is called Yoga" (2.48) "Yoga is skill in action" (2.50) "Know that which is called yoga to be separation from contact with suffering" (6.23) |- |Yoga Sutras of Patanjali |c. first centuries CE |1.2. yogas chitta vritti nirodhah - "Yoga is the calming down the fluctuations/patterns of mind"1.3. Then the Seer is established in his own essential and fundamental nature.1.4. In other states there is assimilation (of the Seer) with the modifications (of the mind). |- |Yogācārabhūmi-Śāstra (Sravakabhumi), a Mahayana Buddhist Yogacara work | 4th century CE |"Yoga is fourfold: faith, aspiration, perseverance and means" (2.152) |- |Kaundinya's Pancarthabhasya on the Pashupata-sutra | 4th century CE |"In this system, yoga is the union of the