258. Develop the meditation that is like water, for in so doing, pleasant and unpleasant sensory impressions that have arisen and taken hold of thought will not persist. Just as people wash away faeces and urine, spittle, pus and blood, and yet the water is not troubled, worried or disgusted – even so, develop the meditation that is like water.
Majjhima Nikaya I.423
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I am intrigued but completely at a loss. Is this verse meant to apply to all types of meditatons or a specific technique?