 It interfaces these with its epistemic theory of knowledge, that is perception, inference and the testimony of reliable person, then presenting its theory of error, theory of complacency, theory of virtue and necessary conditions for suffering, happiness and release.The verses 60-69 begin by stating the duality theory of the Samkhya school, which asserts that Prakriti (nature) and Purusha (soul) are absolutely separate.The Karika, in verse 63, asserts that human nature variously binds itself by a combination of seven means