Then that which is known as yajña (sacrifice) is brahmacarya. This is because one who knows the Self attains Brahmaloka through brahmacarya. Again, that which is known as iṣṭa (worship) is brahmacarya, for the desired Self is attained through brahmacarya.
Then, that which is known as ‘Sattrāyaṇa’ (a sacrifice lasting a long time) is brahmacarya, for it is through brahmacarya that the individual self gets liberated (attains union with the Cosmic Self). Then, that which is called ‘mauna’ (silence) is brahmacarya, for through brahmacarya one realizes the Self, and having realized the Self one remains absorbed in the thought of it.
Then, that which is known as ‘anāśakāyana’ (the path of fasting) is brahmacarya, for through brahmacarya one attains the Self which is immortal. Then, that which is called ‘araṇyāyana’ (life in the forest) is brahmacarya. This is because in Brahmaloka, which is the third world from the earth, there are two oceans called Ara and Ṇya. There also one finds a lake called Airammadīya (so-called because its waters are intoxicating), a peepal tree always exuding soma juice, a city called Aparājitā (the Invincible) belonging to Brahmā, and a canopy of gold specially made by the Lord.
When they attain through brahmacarya the two oceans, Ara and Ṇya, in Brahmaloka, that Brahmaloka is theirs, and they can then move freely in all the worlds.