Madhvaon Brahma Sūtra 2.2.6

What good is likely to be wrought by that system which does not recognise Dharma and Adharma (res- pectively the causes of merit and demerit). (Dharma and Adharma are not object of actual perception. And the Charvaka does not recognise them, since he would not admit anything (to exist) except on the authority of his own senses). Consequently (when he calls his theory a philosophical system, and still fails to recognise Dharma and Adharma) there is a plain self-contradication ; so the system is to be rejected. The Sutrakara now refutes the theory ©f another sect of the Sankhyas, that Prakriti (conjointly) with a subordinate soul or Purusha is the cause of the world.