Yōga Sūtras
Yōga Sūtra 1.22
मृदुमध्याधिमात्रत्वात्ततोऽपि विशेषः।
As such they are distinguished as mild, medium, and superior.
Based on the intensity and speed of practice the practice is classified as mild, medium, or extreme.

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ॐ असतो मा सद्गमय। तमसो मा ज्योतिर्गमय। मृत्योर्माऽमृतं गमय। ॐ शान्ति: शान्ति: शान्ति: ॥ - बृहदारण्यकोपनिषद् 1.3.28
"Ōm! Lead me from the unreal to the real, from darkness to light, and from death to immortality. Let there be peace, peace, and peace. Ōm!" - Brihadaranyaka Upanishad 1.3.28

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