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According to the lineage texts on prayer wheels, prayer wheels are used to accumulate wisdom and merit (good karma) and to purify negativities (bad karma). In Buddhism, Buddhas and Bodhisattvas have created a variety of skillful means to help bring practitioners ever closer to realizing enlightenment. The idea of spinning mantras relates to numerous Tantric practices whereby the Tantric practitioner visualizes mantras revolving around the nadis and especially around the meridian chakras such as the heart and crown. Therefore, prayer wheels are a visual aid for developing one's capacity for these types of Tantric visualizations. The spiritual method for those practicing with a prayer wheel is very specific (with slight variations according to different Buddhist sects). The practitioner most often spins the wheel clockwise as the direction in which the mantras are written is that of the movement of the sun across the sky.