They think that all this is produced from and absorbed into the unmanifest. He who, even for the short space of time covered by a single breath, when his end comes, becomes equable, attaining to the self, fits himself for immortality. Controlling the self in the self, even for the space of a wink, one goes, through the tranquility of the self, to that which forms the endless acquisition of those that are endued with knowledge. Restraining the vital airs again and again by controlling them according to the method called Pranayama (suppression of vital airs), by the ten or the twelve, he attains to that which is beyond the four and twenty.
मन्यन्ते सर्वमप्येतदव्यक्तप्रभवाव्ययम्॥ उच्छ्वासमात्रमपि चेद् योऽन्तकाले समो भवेत्। आत्मानमुपसङ्गम्य सोऽमृतत्वाय कल्पते॥ निमेषमात्रमपि चेत् संयम्यात्मानमात्मनि। गच्छत्यात्मप्रसादेन विदुषां प्राप्तिमव्ययाम्॥ प्राणायामैरथ प्राणान् संयम्य स पुनः पुनः। दशद्वादशभिर्वापि चतुर्विंशात् परं ततः॥