अथान्यत्राप्युक्तम् निद्रेवान्तर्हितेन्द्रियः शुद्धितमया धिया स्वप्न इव यः पश्यतीन्द्रियबिलेऽविवशः प्रणवाख्यं प्रणेतारं भारूपं विगतनिद्रं विजरं विमृत्युं विशोकं च सोऽपि प्रणवाख्यः प्रणेता भारूपः विगत निद्रः विजरः विमृत्युर्विशोको भवतीत्येवं ह्याह एवं प्राणमथोङ्कारं यस्मात्सर्वमनेकधा ।युनक्ति युञ्जते वापि यस्माद्योग इति स्मृतः ॥एकत्वं प्राणमनसोरिन्द्रियाणां तथैव च ।सर्वभावपरित्यागो योग इत्यभिधीयते ॥ ॥६.२५ ॥
In plain words
And it is said elsewhere too: He who, with his senses withdrawn as though in sleep, sees with a wholly purified understanding, as though in a dream, in the hollow of the senses, and is not under their sway, the leader called the Praṇava, whose form is light, sleepless, ageless, deathless and sorrowless — he too becomes one called the Praṇava, a leader whose form is light, sleepless, ageless, deathless and sorrowless. So it is said: "Since he joins the breath and Om and all this in its manifoldness — or since they are joined — it is called yoga, the joining. The oneness of breath and mind and of the senses likewise, and the giving up of every state of being — that is what is called yoga."