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28. By the practice of the different parts of Yogas the impurities being destroyed, knowledge becomes effulgent up to discrimination.

Now comes the practical knowledge. What we have just been speaking about is much higher. It is away above our heads, but it is the ideal. It is first necessary to obtain physical and mental control. Then the realisation will become steady in that ideal. The ideal being known, what remains is to practise the method of reaching it.

यम-नियमासन-प्राणायाम-प्रत्याहार-धारणा-ध्यान-समाधयोऽष्टावङ्गानि ॥२९॥