 Nature merely undergoes modification, transformation, or change in appearance, but this is innate effect that already was in the cause, because asserts "Karika", nothing cannot produce something.The "Karika" defines Prakriti as "that nature which evolves", and asserts to be the material cause of the empirically observed world.Prakriti, according to the text, both physical and psychical, is that which is manifested as the matrix of all modifications.