You say that your mind unfortunately runs away now and then. That is the business of the mind, but if you simply fix up your mind on the Lotus Feet of Krishna, the rascal mind cannot disturb you anymore. My Guru Maharaja used to say that just rise early in the morning and then kick the mind with a shoe one hundred times. Then while going to sleep, one should take a broomstick and strike the mind another hundred times. The mind is so restless, that it can be brought to tameness only by the process suggested by Bhaktisiddhanta Sarasvati Thakura. So you should try this process and stop the mind from running away now and then. If you follow the process of Bhaktisiddhanta Sarasvati, naturally He will help you in controlling the mind and bestow all His blessings upon you.
Letter to Rayarama, 29 June, 1969