Karma: Buddhist Action Defined.

‘The Buddha ascribes a special status to in the human realm (this realm is number 5 of the 31 – which occurs as a karmic stage within the broad category of ‘kama loka’, and is known as the ‘manussa loka’ – with ‘manussa’ meaning ‘human), and in so doing automatically elevates this karmic formation as being superior in potential to all other realms, or types of re-birth. It is true, of course, that as long as an ordinary human remains with a mind driven by craving (tanha), no progress can be made and the individual, as a collection of habitual tendencies will bob around on the karmic seas for innumerable ages, experiencing the painful fruits (vipaka) of karma. However, despite this immense image of futile suffering, the Buddha teaches that salvation is possible on the human plane through the understanding and practicing of the noble eightfold path – which is contained within the teachings of the four noble truths.’