When men of knowledge, conversant with the rules of Yoga, become as fixed as a stake of wood, and as immovable as a mountain, then they are said to be in Yoga.
स्थाणुवच्चाप्यकम्पः स्याद् गिरिवच्चापि निश्चलः। बुद्ध्या विधिविधानज्ञास्तदा युक्तं प्रचक्षते॥