Chapter 5, Verse 27
Part of 5: Karm Sanyās Yog — कर्मसंन्यासयोगस्पर्शान्कृत्वा बहिर्बाह्यांश्चक्षुश्चैवान्तरे भ्रुवोः। प्राणापानौ समौ कृत्वा नासाभ्यन्तरचारिणौ॥
sparśhān kṛitvā bahir bāhyānśh chakṣhuśh chaivāntare bhruvoḥ prāṇāpānau samau kṛitvā nāsābhyantara-chāriṇau yatendriya-mano-buddhir munir mokṣha-parāyaṇaḥ vigatechchhā-bhaya-krodho yaḥ sadā mukta eva saḥ
Shutting out all external contacts and fixing the gaze between the eyebrows, realizing the outgoing and incoming breaths moving within the nostrils.
The verses 27 and 28 deal with the Yoga of meditation (Dhyana). External objects or contacts are the sound and the other senseobjects. If the mind does not think of the external objects they are shut out from the mind. The senses are the doors or avenues through which sound and the other senseobjects enter the mind. If you fix the gaze between the eyrows the eyalls remain fixed and steady. Rhythmical breathing is described here. You will have to make the breath rhythmical. The mind becomes steady when the breath becomes rhythmical. When the breath becomes rhythmical there is perfect harmony in the mind and the whole system. (Cf. VI.10?14VIII.10)