Life and peace

Continuing with my reading of Romans, I came across 8:5b, "...those who are controlled by the Holy Spirit think about things that please the Spirit."

My immediate thought was, "No I don't...". I think I'd love to say, that even though I work full time for a church and I'm in countless times of prayer and bible studies, that I'm always really holy...but I'm not. There's time where I struggle. But check this out for an incentive "...letting the Spirit control your mind leads to life and peace." 8:6b

So....what are the things we need to let go of?