If I train my mind to become my enemy, then my life is unsuccessful. Anātmanas tu śatrutve vartetātmaiva śatruvat (BG 6.6). But one who has no knowledge of the spiritual self, then his mind acts like his enemy. One who has got the conception of this body as "my self," his mind is his enemy. And one who has got the conception of the spirit self, his mind is his friend.
So mind has nothing to do. Mind . . . simply training of the mind required. And how the mind is trained up? It is by good association. Good association, our mind is trained up. Saṅgāt sañjāyate kāmaḥ (BG 2.62). Kāma means desire. Desire is the function of the mind. And saṅgāt sañjāyate kāmaḥ. And according to the association, my mind desires like that.
So, so we have to make good association if we want to make our mind as my friend. If I want to make my friend . . . my mind as my friend, then I have to associate with sādhu. Tasmāt satsu sajyeta buddhimān. Buddhimān means intelligent person. He must associate with satsu. Satsu means those who are trying for self-realization.
They are called sat. Sat and asat. Asat means who are trying for the temporary things. Matter is temporary. My body is temporary. So if I simply engage myself for bodily pleasure, sense gratification, then I am engaging myself to temporary things. But if I engage myself for self-realization, the permanent thing, then I am engaging myself to the sat, or to the permanent.
So tasmāt satsu sajyeta buddhimān. "Anyone who is intelligent, he should associate with persons who are trying to elevate themself for self-realization." That is called sat-saṅga, good association. And what is the result of good association? Now, because, if we make good association, the santāḥ chindanti. Santāḥ means the persons who are sādhu, who are pious. They can cut off by their words our attachment with this material world. They can cut off.
Just like Kṛṣṇa is speaking to Arjuna. What is the idea of speaking so many things? Just to cut off his attachment from the so-called material affection. He is affected with something which is stumbling his progress in his own duty. So He is . . . Kṛṣṇa is presenting His Bhagavad-gītā just to cut off. Santā eva hi chindanti uktibhiḥ. Uktibhiḥ. Chindanti means cut.
Now, for cutting something we require some sharpened instrument. But here, to cut off the mind from attachment, it requires sharpened ukti. Ukti means words. Sharpened topics. There should not be . . . just like when a person cuts something, there is no mercy, similarly, when a sādhu, or a person saint, speaks to his saints er to his student, he does not make . . . show any mercy. He speaks the truth so that his mind may be cut off from the unreal attachment.