The mind is always controlled by something. There is no question of us being able to control the mind. Therefore when we are dealing with Krsna more and more, all the time, then the mind becomes controlled by Krsna and if we are dealing with material things then the mind gets controlled by material things because the mind is always controlled by external things.
Source: https://www.kksblog.com/2016/01/controlling-the-mind-2/
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