alikimr
Here's an excerpt:
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In the Jataka tales, we read stories of the Buddha in his previous lives as a Bodhisattva, an individual destined for enlightenment and Buddhahood. ('Bodhi' means 'enlightenment' or 'wisdom' and 'sattva' means 'being' or 'essence'). As Mahayana Buddhism developed, the idea of the Bodhisattva became imbued with increasing significance. Whereas Theravada Buddhism appeared to focus on sainthood and the individual's solo quest for enlightenment, Mahayana Buddhism emphasized the role of the Bodhisattva as a supremely compassionate individual who is motivated to win enlightenment not for himself but for the benefit of all sentient beings.
Bodhicitta
The process of becoming a Bodhisattva starts with Bodhicitta, the selfless aspiration to win enlightenment for the benefit of others. Subsequent to this is the Bodhisattva vow, where a conscious commitment is to save all beings from the vicissitudes and dissatisfaction of samsara. Along the Bodhisattva path, there are six perfections to be acquired. These are: giving (dana), morality (sila), patience (ksanti), vigor (virya), meditation (dhyana) and wisdom (prajna). On acquiring the sixth perfection, the Bodhisattva could enter nirvana but decides to postpone this so that he can be of help to other beings. There are said to be ten stages (bhumi) through which a Bodhisattva progresses, culminating in Buddhahood.
Putting Others First
But what is significant about this emphasis on the Bodhisattva and his or her desire to postpone enlightenment for the sake of others? At its core is the conception of Buddhism as a deeply compassionate religion in which true wisdom derives from putting others first, no matter what the cost to oneself. Santideva, the eighth century Indian sage, wrote: "Whosoever longs to rescue quickly both himself and others should practice the supreme mystery: exchange of self and other". He continues, "All those who suffer in this world do so because of their desire for their own happiness. All those happy in the world are so because of their desire for the happiness of others".
Avalokiteshvara
It is no surprise that one of the most revered Bodhisattva figures is Avalokiteshvara, Bodhisattva of Compassion. In Tibetan Buddhism, he takes the form of Chenrezi and in China he is embodied in the female form known as Kwan-Yin . Translated literally, 'Avalokiteshvara' means 'the one who sees', in the sense that he perceives the suffering of others he looks down on. The many eyes of Avalokiteshvara depicted in Buddhist iconography reflect this. The many hands that are also seen in some depictions of Avalokitesvara are also symbolic of the help he is ready to give to those who need it.
The Bodhisattva Vow
One translation of the Bodhisattva vow goes like this:
However innumerable sentient beings there are, I vow to save them
However inexhaustible the defilements are, I vow to extinguish them
However immeasurable the truth is, I vow to expound it
However incomparable enlightenment is, I vow to attain it!
The Bodhisattva ideal is a high ideal. Nevertheless, many Buddhists who have engendered Bodhicitta and taken the Bodhisattva vow have begun so in the knowledge that this is a process which will take many lifetimes. However, the short term benefits - the development of generosity, patience, vigor and so on - will be of immediate benefit to others right now!
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http://buddhism.about.com/library/weekly/aa091802a.htm