these three qualities. According to Samkya school, no one and nothing is either purely Sattvik or purely Rajasik or purely Tamasik. One's nature and behavior constitute a complex interplay of all of all three gunas, in varying degrees. In some, the conduct is Rajasik with significant influence of Sattvik guna; in some it is Rajasik with significant influence of Tamasik guna, and so on. The balance of Gunas of everything and everyone can change and does. However, change in one quality faces inertia from other two qualities in Indian worldview. Change needs internal or external influence or reinforcement, as knowledge and force to transform. The force to change comes from the Rajas guna, the Sattva guna empowers one towards harmonious and constructive change, while Tamas guna checks or retards the process. In Indian mythology, Vishnu is envisioned with more Sattva, Brahma with more Rajas, and Shiva seen with all three Gunas. Nyaya school of Hinduism In Nyaya (Generality or common features) school of Hinduism, there is extensive debate on what Guna means, and whether quality is innate, subjective or describable. Early scholars of this school identified 17 qualities, which later scholars expanded to 24 . Different scholars of this school list the 24 differently; for example, Bhasarvajna disallows 6 of the 24 commonly accepted by the ancient scholars. The most commonly accepted list is: color, taste, smell, touch, number, contact, disjunction, farness, nearness, dimension, separateness, knowledge, pleasure, frustration, desire, hatred, effort, weight, fluidity, viscosity, dispositional tendency, merit, demerit, and sound. Nyaya school considers quality as non-repeatable, a conceptual theme not found in Western philosophy where "quality" is presumed to be repeatable. It is also not found in some parallel schools of Hinduism. Repeatability means that the white in one object is same as white in other object, and white means the same thing. Nyaya scholars hold that "whiteness" is a guna of "white", but that is different from "whiteness" of an object or living being. To them, white has many hues and the "whiteness" is subjective. In Laksanavali, an ancient Indian text by Udayana, Guna is discussed with more nuance. For example, he writes, "quality of earth" is specific only if it meets three conditions: it occurs in earth, does not occur in anything that is not earthy, and be a distinctive quality that cannot be described as combination of other qualities. Vaisheshika school of Hinduism In Vaisheshika school of