From Ohr Avigdor Shaar Bitachon by Rabbi Avigdor Miller
The world can bring in all kinds of phantom ideas and thoughts that flit across the screen of a person’s mind, and the picture that he had first made with his own bechirah (free will) can become blurred.
A person has to work on focusing his mind against distractions, but he needs help from Hashem. He should ask Hashem to guard him against all the false impressions that are prevalent in the world. Newspapers and literature, the way people talk, fads, and trends all are disturbances of the mind and even the most elevated person has to ask Hashem to be protected against all these influences. (... )
So the first of the requests is to ask Hashem to protect you from all the things that distract you from your original good intention, from the influence of the environment, from people, and from ideas that come into your mind.