When we face such temptations in our time, we must declare, as young Nephi did in his, “[I will] give place no more for the enemy of my soul.”¹² We can reject the evil one. If we want it dearly and deeply enough, that enemy can and will be rebuked by the redeeming power of the Lord Jesus Christ. 

Jeffery R. Holland 

Combating Pornography

http://www.lds.org/family/family-well-being/combating-pornography/audiences/individuals/place-no-more-for-the-enemy-of-my-soul?lang=eng