a spiritual battle

"Who says nothing is impossible.

 I've been doing nothing for years."

It's easy to let my mind go to negative places if I am not alert. Negativity takes the path of least resistance. I wonder if that's why people say they are "down"? Gravity has a way of taking hold spiritually, too I suppose. I read about how we must bring all thoughts into captivity. It's possible to control many aspects of my life just by eating right, being around positive people and exercising but there are some things I need help in. There are somethings only Jesus can help me with regarding...well, regarding me.
I know that striving to be a good Christian takes controlling my actions, but much deeper than that, my thoughts.
There is so much good practical advice in the Bible. Striving to be a good Christian is a 24 hour job. Thinking of whatsoever things are pure, lovely, and of a good report. What sweet scriptures for doing a spiritual battle.