Jnana, knowledge, sections of Vaikhanasa texts are short and it is necessary to infer their doctrines from discussions in the texts on ritual. The Vaikhanasas evolved the theory of the five aspects of Vishnu: Vishnu, the all-pervading supreme deity; Purusha, the principle of life; Satya, the static aspect of deity; Achyuta, the immutable aspect; and Aniruddha, the irreducible aspect. The distinction is emphasised between Vishnu in his Niskala presence, the unfigured primeval and indivisible form unperceived even by Brahma, and his Sakala presence, the figured, divisible, emanated, and movable form. In his sakala presence he responds gracefully to devotional meditation. Shri is important as nature, Prakriti, and as the power, Shakti, of Vishnu.