What is role of mind in practicing Celibacy/Brahmcharya?

You should never proceed as guided by your mind. If the mind says according to what the Gnan says then one may adjust accordingly. If it goes against what our Gnan says, then you must stop it. Look how wise Kabir was when he said, four hundred years ago, that, ' The one who lets his mind rule his actions loses everything'. Was Kabir not wise? People are governed by their minds. If your mind says, 'Get married to this person', does that mean you have to get married?

Questioner : No. That cannot happen.

Dadashri : What will you do when the mind still says that? You will have to remain strong if you want to practice brahmacharya. The mind can say anything and it will make you say the same. That is why I was saying that tomorrow morning you would run away. What is the reason for this? How can you trust the one who is dictated by his mind?

Questioner : Now, I would not run away from here.

Dadashri : Oh, but what guarantee is there that a man who is governed by his mind will not run away from here? Here, if I scold you for two days, then you would leave on the third day. You do know this. How can you trust your mind? At the moment your mind helps you by telling you: 'It is not worth getting married, there are too many problems in marriage'. It is your mind that first shows you this principle, which you have decided through your mind and not through Gnan. It is the mind that showed you the principle to do this.

Questioner : If the firm decision was made through Gnan, then the mind would not go against you, would it?

Dadashri : No, it would not. The foundation for firm decisions (nischaya) made through Gnan is different. All their foundations are like R.C.C (reinforced cement concrete) while the others like those made by the mind are like those made out of mixture of gravel and concrete (non reinforced) which are prone to crack.

Glossary: Brahmacharya -  Celibacy (Absolute freedom form sexual impulses through mind-speech-body)
Gnan -  Dadashri uses the word gnan for three types of knowledge: Gnan with capitalized 'G' is the knowledge of the Self (spiritual knowledge). The second gnan is the knowledge of cause and effects, life after life, and the third gnan is the worldly knowledge of human beings; The knowledge of the Self and of the doer through Gnan Vidhi in Akram Vignan 

Reference: Book Name : Brahmacharya : Celibacy - Attained With Understanding (Page #29, Paragraph #5 onwards and Page #30, Paragraph #1-6 )