The jiva is believed to rely on other dravya to function. The Jain philosophy completely separates body (matter) from the soul (consciousness). Souls reside in bodies and journey endlessly through saṃsāra (that is, realms of existence through cycles of rebirths and redeaths). Ajiva consists of everything other than jiva. Life processes such as breath means of knowledge such as language, all emotional and biological experiences such as pleasure and pain are all believed in Jainism to be made of pudgala (matter). These interact with tattva or reality to create, bind, destroy or unbind karma particles to the soul. According to Dundas, Dharma as a metaphysical substance in Jain philosophy may be understood as "that which carries" instead of the literal sense of ordinary physical motion. Thus, dharma includes all verbal and mental activity that contributes to karma and purification of the soul.