The Supreme Personality of Godhead in His transcendental form of Narahari, Nrsimha-deva, is always ready to kill the demons, who always create disturbances in the minds of honest devotees. To spread the Krsna consciousness movement, devotees have to face many dangers and impediments all over the world, but a faithful servant who preaches with great devotion to the Lord must know that Lord Nrsimha-deva is always his protector.

From Srila Prabhupada’s purport to SB 7.8.51