Purity (suddha) is an important concept within much of Theravada and Mahayana Buddhism, although the implications of the resultant moral purification may be viewed differently in the varying traditions. The aim is to purify the personality of the Buddhist practitioner so that all moral and character defilements and defects (kleshas such as anger, ignorance and lust) are wiped away and Nirvana can be obtained.
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Theravada Buddhism regards the path of self-purification as absolutely vital for the reaching of nibbana/nirvana. The main task of the Theravada Buddhist monk is to eradicate moral and character flaws through meditation and moral cultivation, in alliance with the cultivation of insight (panna/ prajna), so that the purity of nibbana can be achieved. So important is this notion of purity in Theravada Buddhism that the famed Buddhist monk and commentator, Buddhaghosa, composed a central thesis on dhamma (Buddhism) called The Path of Purity (Visuddhi-magga).
Controversially, according to the Mahayana Tathagatagarbha sutras, the unsullied essence or "true self" (also termed the Buddha nature) of the being can be laid bare and become manifest once the temporary and superficial contaminants (kleshas) have been eradicated from its presence [1][2]. These contaminants are seen as extrinsic to, rather than inherent within, the essence of the being.
The resulting Buddha (after the kleshas have been eliminated) is referred to in the Tathagatagarbha literature and in the works of the Tibetan Jonangpa lama Dolpopa as the 'pure Self'[3].
The Perfection of Wisdom sutras of Mahayana Buddhism, in contrast, would ultimately view both impurity and purification as illusory, without any basis to either. Neither has an enduring essence and so is not truly 'fake', according to these ideas, but is merely a name or concept. Nevertheless, these scriptures do teach the need to detach from all moral defilements if Buddhahood is to be reached for the sake of awakening all sentient beings.