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In page Islamic ethics:

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The science also dwells on how the level of human virtue is determined by discipline and effort;[3] the movement between the extremes of human behavior, "the lowest is below beasts and the highest surpasses even the angels;"[4] how 'knowledge is the thickest of veils', preventing man from seeing reality (haqiqah when ethics and purification (tazkiyah) have not been mastered; and how by improving their akhlaq, the Muslims improve their Ibadah (worship).[citation needed]