Bhagavad Gītā Chapter Six verse 12

तत्रैकाग्रं मन: कृत्वा यतचित्तेन्द्रियक्रिय ।
उपविश्यासने युञ्‍ज्याद्योगमात्मविश‍ुद्धये ॥

tatra-ekāgraṃ manaḥ kṛtvā yata-citta-indriya-kriyaḥ |
upaviśya-āsane yuñjyād yogam-ātma-viśuddhaye ||

tatra - in that place, there; thither, to that place; in that, therein, in that case, on that occasion, under those circumstances, then, thereforeekāgra - one-pointed; having one point; fixing one's attention upon one point or objectmanas - mind; that which objects of sense affect; the faculty or instrument through which thoughts enterkṛtvā - having done, made, performedyata - restrained, held in, held forth, kept down or limited, subdued, governed, controlledcitta - psyche (the totality of the human mind, conscious and unconscious); mind; heartindriya - faculty of sense; sense; organ of sense; organs of motor action and sensory perceptionkriyā - doing, performing, performance, occupation with, business, act, action, undertaking, activity, work, labour; bodily action, exercise of the limbs; medical treatment or practice, applying a remedy; a religious rite or ceremony, sacrificial actupaviśya - having sat down, sitting downāsana - particular posture; sitting, sitting down; seat, place, stool; abiding, dwellingyuñjāna - the act of uniting, joining, arranging, performing, yoking, fixingyoga - the act of yoking, joining, attaching, harnessing; a yoke, team, vehicle, conveyance; employment, use, application, performance; a means, expedient, device, way, manner, methodātman - essence; the highest personal principle of life; the individual soul, selfviśuddhi - special purity; complete purification, purity; rectification, removal of error or doubt

Commentaries and Reflections

Commentary by T Krishnamacharya:

Fixing the Manas in a particular place,
disciplining the senses,
seated in a proper posture,
a person begins Yoga for Citta Śuddhi.”

Commentary by Paul Harvey:

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