Chapter VI Sloka 35

As<zy< mhabahae mnae inRh< clm!,
A_yasen tu kaENtey vEraGye[ c g&te.

rbhagavnuvca | 
asaaya mahbho 
mano durnigraha calam | 
abhysena tu kaunteya 
vairgyea ca ghyate ( 6|35)||

The Blessed Lord said:
Undoubtedly,O mighty-armed Arjuna, the mind is difficult to control and restless; But by practice and by dispassion it may be restrained.
Commentary: The sustained or repeated effort to keep the wandering mind steady by constant meditation on the Lakshya (centre, ideal, goal, or object of meditation) is Abhyasa or practice. The same idea or thought of the Self or God is constantly repeated. This constant repetition destroys Vikshepa or the vacillation of the mind and desires, and makes it steady and one-pointed.
Vairagya is dispassion or indifference to sense-objects in this world or in the other, here or hereafter, seen or unseen, heard or unheard, achieved through constantly looking into the evil in them (Dosha-Drishti). You will have to train the mind by constant reflection on the immortal, all-blissful Self. You must make the mind realise the transitory nature of the worldly enjoyments. You must suggest to the mind to look for its enjoyment not in the perishable and changing external objects but in the immortal, changeless Self within. Gradually the mind will be withdrawn from the external objects.