Chapter VI Sloka14

àzaNtaTma ivgt-IäRücairìte iSwt>,
mn> s<yMy mi½Äae yu­ AasIt mTpr>.

praþ˜nt˜tm˜ vigatabheer
brahmac˜rivrate sthita× |
mana× saÕyamya maccitto 
yukta ˜seeta matpara× ( 6|14)||

Serene-minded, fearless, firm in the vow of a Brahmchari, having controlled the mind, thinking of Me and balanced in mind, let him sit, having Me as his supreme goal.
Commentary: The spiritual aspirant should possess serenity of mind. The Divine Light can descend only in a serene mind. Serenity is attained by the eradication of Vasanas or desires and cravings. He should be fearless. This is the most important qualification. A timid man or a coward is very far from Self-realisation.
A Brahmachari (celibate) should serve his Guru or the spiritual preceptor whole-heartedly and should live on alms. This also constitutes the Brahmchari-Vrata. The aspirant should control the modifications of the mind. He should be balanced in pleasure and pain, heat and cold, honour and dishonour. He should ever think of the Lord and take Him as the Supreme Goal.
Brahmcharya also means continence. Semen or the vital fluid tones the nerves and the brain, and energises the whole system. That Brahmchari who has preserved this vital force by the vow of celibacy and sublimated it into Ojas Sakti or rediant spiritual power can practise steady meditation for a long period. Only he can ascend the ladder of Yoga. Without Brahmcharya or celibacy not an iota of spiritual progress is possible.

Continence is the very foundation on which the superstructure of meditation and Samadhi can be built up. Many persons waste this vital energy-a great spiritual treasure indeed-when they become blind and lose their power of reason under sexual excitement. Pitiable is their lot! They cannot make substantial progress in Yoga.