This thesis aimed to study three objectives of the research: 1) to study the impurity in Theravada Buddhism, 2) to study methods for eliminating impurity in Theravada Buddhism, 3) to study of application of Buddha-dharma for eliminating impurity in Theravada Buddhism. This research is a qualitative study focusing on documentary by collecting information from the Tipitaka, commentary, related documents, and bringing them to study and explain in descriptive terms.
    The research found that thestains (mala) in Buddhism means impurities, sadness, frustration, and extinction, the abuse of the Lord Buddha’s commandment, the nature of the mind that is in accordance with the power of defilement has 2 types: external and internal impurity. The penalty for misconduct in the tainted that caused sadness, frustration, depletion and suffering.The things that cause impurities such as anger, hate, jealousy, laziness, boastfulness, illusion, insanity and wrong view.
    The method of eliminating impurity in order to be happy both in present life and in the further lives  is reserving themselves from greed, hate and delusion not appear in mind to be impurity and that will use the principles of the precepts observing and meditation practice for physical, verbal, and mental peace. In the way of applying the principles of Noble Eightfold Paths, the principles of Buddha teaching, the principles of goodness, principles of meditation practice, in order that live a good life with intelligence. The result of elimination of impurity brings living in peace, do not fear that there is someone who violate ourselves. If one passing away from this world, one will reach heaven or the good state of existence eternally.
    The method of eliminating the impurity in Theravada Buddhism, it was found that the elimination of the impurities has made advantages, namely, making life understanding in the principles of the teachings of the Lord Buddhafor the end of passion which caused the sin to be defiled, both physically, verbally, and mentally, to be depleted by following the principles of Buddhism, and being with the discipline, making a good mind, leaving from all suffering,resulting in higher quality of mind, body, verbal, clean and pure mind, after all beings died from this world, they will be born in the heaven and achieved the extremely benefits in Buddhism where they will release from the cycle of rebirth any longer.

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