Knowing Ātman, also referred to as self-knowledge, is one of the defining themes of all major orthodox schools of Hinduism, but they diverge on how. In Hinduism, self-knowledge is the knowledge and understanding of Atman, what it is, and what it is not. Hinduism considers Atman as distinct from the ever-evolving individual personality characterized with Ahamkara (ego, non-spiritual psychological I-ness Me-ness), habits, prejudices, desires, impulses, delusions, fads, behaviors, pleasures, sufferings and fears. Human personality and Ahamkara shift, evolve or change with time, state the schools of Hinduism; while, Atman doesn't. Atman, state these schools, is the unchanging, eternal, innermost radiant self that is unaffected by personality, unaffected by ego of oneself, unaffected by ego of others; Atman is that which is ever-free, never-bound, one that seeks, realizes and is the realized purpose, meaning, liberation in life. Puchalski states, "the ultimate goal of Hindu religious life is to transcend individually, to realize one's own true nature", the inner essence of oneself, which is divine and pure.