Buddhism on Nirvana
According to wikipedia, Nirvana is, in Buddhism:
Nirvāṇa (Devanagari निर्वाण, Pali: Nibbāna निब्बान -- Chinese: 涅槃; Pinyin: nièpán, Japanese: nehan, Thai: Nibpan นิพพาน ), is a Sanskrit word from India that literally means extinction (as in a candle flame) and/or extinguishing (i.e. of the passions).
It is a mode of being that is free from mind-contaminants (Kilesa) such as lust, anger or craving. It is thus a state of great inner peace and contentment - the end of suffering, or Dukkha. The Buddha in the Dhammapada says of Nirvana that it is "the highest happiness." This is not the transitory, sense-based happiness of everyday life, but rather an enduring, transcendental happiness integral to the calmness attained through enlightenment.
The Buddha describes the abiding in nirvana as 'deathlessness' (Pali: amata or amaravati) or 'the unconditioned' and as the highest spiritual attainment, the natural result that accrues to one who lives a life of virtuous conduct in accordance with Dharma. Such a life (called Brahmacarya in India) dissolves the causes for future becoming (Skt, Karma; Pali, Kamma) that otherwise keep beings forever wandering through realms of desire and form (samsara).
This is mostly the Theravada interpretation of Nirvana. Mahayana
Buddhism complicates things a bit with its Bodhisattva
ideal. The Bodhisattva actually gives up full enlightenment in
order to 'help and save humanity'. Still, divine Bodhisattvas are
considered enlightened compared to 'normal human beings'. They are in
effect in the possession of the knowledge of the path leading to
enlightenment, because otherwise they would not have been able to give
up full Nirvana.
Moksha in Hinduism
On Moksha in Hinduism wikipedia mentions the following:
In Hinduism, liberation occurs when the individual soul (human mind/spirit) or jīvatman recognizes its identity with the Ground of all being - the Source of all phenomenal existence known as Brahman. It is technically incorrect, nonetheless, to view them - both often spoken of as Self - as a monist being of sorts, something possessing substances, qualities or attributes. In actuality, Hindu scripture like the Upanishads and Bhagavad Gita, and especially the works of the non-dualistic Hindu school, Advaita Vedanta, say that the Self or Super-Soul is formless, beyond being and non-being, beyond any sense of tangibility and comprehension. Moksha is seen as a final release from one's worldly conception of self, the loosening of the shackle of experiential duality and a re-establishment in one's own fundamental nature, though the nature is seen as ineffable and beyond sensation. The actual state of salvation is seen differently depending on one's beliefs.
- In Advaita philosophy, the ultimate truth is not a singular Godhead, per se, but rather is oneness without form or being, something that essentially is without manifestation. Moksha is union with this oneness. The concepts of Moksha and Buddhist Nirvana are comparable. Indeed, there is much overlap in their views of consciousness and attainment of enlightenment. For liberal Advaitists, Moksha is seen as complementing, rather than denying, the 'voidness' of Buddhism.
- In dualist and qualified advaitic Hinduism, Moksha means union or close association with God. See Krishnology.
The debate between Hinduism and Buddhism on enlightenment is an
eternal one. It started when the Buddha denied that there was anything
permanent in consciousness (the fifth skandha). It hasn't ended since.
There are people who see mostly the convergence of experience and
doctrines in (especially) Advaita Vedanta and Mahayana Buddhist
'Emptiness'. One example of this view is an article by Bijoy H. Boruah 'Atman in
Sunyata and the Sunyata of Atman'.