There is one easy weapon with which the mind can be conquered — neglect. The mind is always telling us to do this or that; therefore we should be very expert in disobeying the mind’s orders. Gradually the mind should be trained to obey the orders of the soul. It is not that one should obey the orders of the mind. Srila Bhaktisiddhanta Sarasvati Thakura used to say that to control the mind one should beat it with shoes many times just after awakening and again before going to sleep. In this way one can control the mind. This is the instruction of all the sastras. If one does not do so, one is doomed to follow the dictations of the mind. Another bona fide process is to abide strictly by the orders of the spiritual master and engage in the Lord’s service. Then the mind will be automatically controlled.

From Srila Prabhupada’s purport to SB 5.11.17