SB 1.1.14

āpannaḥ saṁsṛtiṁ ghorāṁ
 yan-nāma vivaśo gṛṇan
tataḥ sadyo vimucyeta
 yad bibheti svayaṁ bhayam
Synonyms: 
āpannaḥ — being entangled; saṁsṛtim — in the hurdle of birth and death; ghorām — too complicated; yat — what; nāma — the absolute name; vivaśaḥ — unconsciously; gṛṇan — chanting; tataḥ — from that; sadyaḥ — at once; vimucyeta — gets freedom; yat — that which; bibheti — fears; svayam — personally; bhayam — fear itself.
Translation: 
Living beings who are entangled in the complicated meshes of birth and death can be freed immediately by even unconsciously chanting the holy name of Kṛṣṇa, which is feared by fear personified.
Purport: 

Vāsudeva, or Lord Kṛṣṇa, the Absolute Personality of Godhead, is the supreme controller of everything. There is no one in creation who is not afraid of the rage of the Almighty. Great asuras like Rāvaṇa, Hiraṇyakaśipu, Kaṁsa, and others who were very powerful living entities were all killed by the Personality of Godhead. And the almighty Vāsudeva has empowered His name with the powers of His personal Self. Everything is related to Him, and everything has its identity in Him. It is stated herein that the name of Kṛṣṇa is feared even by fear personified. This indicates that the name of Kṛṣṇa is nondifferent from Kṛṣṇa. Therefore, the name of Kṛṣṇa is as powerful as Lord Kṛṣṇa Himself. There is no difference at all. Anyone, therefore, can take advantage of the holy names of Lord Śrī Kṛṣṇa even in the midst of the greatest dangers. The transcendental name of Kṛṣṇa, even though uttered unconsciously or by force of circumstances, can help one obtain freedom from the hurdle of birth and death.