I'm reading a book by Joyce Meyer called a "Battlefield of the Mind" and she mentions this verse. Your thoughts run your actions, so it's easy to not control those thoughts. But it's always left me feeling hopeless. If we stop and think of how negative our mind can be, and how it affects your whole day, it's crazy! Give God that control and he will give you peace.
Love for God, let that help you change the world, but never let the world change your love for God. Because remember, you are Holy when you are in Jesus Christ, so you aren't living for the world's standards anymore, you are living for a Holy Standard.