Kill mental concoction by the sword of Service
No one should neglect to control the mind. If one does, the mind becomes so powerful that one immediately forgets his real position. Forgetting that he is an eternal servant of Krishna and that service to Krishna is his only business, one is doomed by material nature to serve the objects of the senses. One should kill mental concoctions by the sword of service to the Supreme Personality of Godhead and His devotee.
– Srila Prabhupada, Srimad Bhagavatam 5.11 Summary