Lets get back on track...

I have started meeting with a friend who has recently become a Christian and we are getting together weekly to go through a new believers booklet. I am glad to go through it so as to learn again and cement foundational principles which I should already know cold. Going through the first chapter I have realized again how little I have retained over the years. I am so glad for this opportunity to disciple someone and to learn again myself. So, him and I met last week and hit some golf balls at the indoor driving range and also shot the breeze about whatever came up. We were talking and came to conclusion how important the battle of the mind is. Everything is either won or lost in the mind. The Bible speaks about this over and over again, especially in the NT and was wondering what everyone else thought about the MIND?