 Samkhya karika, in verse 9 introduces its theory of "Satkaryavada" (causation), asserting that "the effect is pre-existent in the cause".That which exists, states "Karika", has a cause; that which exists not, lacks a cause; and when there exists a cause, in it is the seed and longing for the effect; that, a potent cause produces that which it is capable of.Hence, it is nature of existence that "perceptible principles exist in nature", and effects are manifestation of the perceptible principles.