Bhaktisiddhanta Sarasvati Thakura said that when a devotee wakes up in the morning he should beat his mind with a shoe a hundred times. Since the mind tends to be very puffed up, it must be beaten to keep it in the proper humble state. In the evening the mind should be beaten with a broomstick another hundred times. The mind is like a wild animal captured from the jungle, it is never fully dependable. If it gets the chance it will run off into the jungle again. Similarly, if the mind is not kept on a tight rope, it will wander off into material engagements and inadvertently one will lose the jewel of Krsna consciousness.
>>> Ref. VedaBase => VK: Verse Eight