Romans 12:2

And do not be conformed to this world, but be transformed by the renewing of your mind, that you may prove what is good and acceptable and perfect will of God.  

We can’t live our lives in a vacuum and only fellowship with Christians every day.  The world is around us, but we don’t need to let it get into us and influence our lives.  What we put in front of our eyes influences what comes out of our hearts. Like eating a lousy diet eventually shows on us physically, so does focusing on worldly ideas over God’s word. When we struggle in our lives, we need to check our focus and refocus on Jesus.