Being Peace by Thich Naht Hahn. That man is a master of meditation and his books changed my life. There really isn't anything to it and if you are trying then you are trying too hard. It's not about what you think when you meditate. It's about letting what you think flow through you

Keep in mind though that your brain works like a muscle in meditation and, like exercise, it's hard at first. But the more you do it the better you get.

One day all of a sudden you come across a situation where in the past you wouldn't have been able to control your emotions, but something like a bell rings and brings you back to that calm Meditative State where you are in control.

It's about finding peace with yourself and the world around you.