It is hard to filter our minds from all the bad in the world. I agree. We CANNOT completely control everything that we hear and see no matter how hard we try, we are living in a world where there is bad all around but we can have self discipline with the Lord's help.Our minds are very powerful and our thoughts control our desires and our desires influences our words and our words influence our actions and they influences our habits and eventually all those things become our character. When we start with the little things we can slowly change and become who it is that we want to be!
“The mind is like a stage,” said President Boyd K. Packer. “Except when we are asleep, the curtain is always up. . . . Always there is some act playing on the stage of the mind.
“Have you noticed that, without any real intent on your part and almost in the midst of any performance, a shady little thought may creep in from the wings and endeavor to attract your attention? . . . If you permit them to go on, all other thoughts, of any virtue, will leave the stage. You will be left, because you consented to it, to the influence of unworthy thoughts” (That All May Be Edified, [1982], 38).
“What do you do at a time like this, when the stage of your mind is commandeered by these imps of unclean thinking? . . . Let me suggest that you choose from among the sacred music of the Church one favorite hymn. I have reason for suggesting that it be a Latter-day Saint hymn, one with lyrics that are uplifting and the music reverent. Select one that, when it is properly rendered, makes you feel something akin to inspiration.
“Now, go over it in your mind very thoughtfully a few times. Memorize the words and the music. . . . Anytime you find that these shady actors have slipped in from the sideline of your thinking onto the stage of your mind, think through this hymn. . . . It will change the whole mood on the stage of your mind. Because it is clean and uplifting and reverent, the baser thoughts will leave” (That All May Be Edified, 38–39).
Ler us fill our minds with the pure and good things of the world and then we can let the Lord change us into who we need to be!