According to Jain cosmology, the universe is made up of six dravya (substances): sentient beings or souls (j va), non-sentient substance or matter (pudgala), principle of motion (dharma), the principle of rest (adharma), space ( k a) and time (k la). The latter five are united as the ajiva (the non-living). As per the Sanskrit etymology, dravya means substances or entity, but it may also mean real or fundamental categories. According to Jain philosophy, this universe consists of infinite jivas or souls which are uncreated and always existing. There are two main categories of souls: unliberated mundane embodied souls that are still subject to transmigration and rebirths in this samsara due to karmic bondage and the liberated souls that are free from birth and death. All souls are intrinsically pure but are found in bondage with karma since beginingless time. A soul has to make efforts to eradicate the karmas attain its true and pure form.