Controlling our state of mind

One of the most difficult and most important disciplines we can impose upon ourselves is that of our states of mind. Though I doubt it is possible utterly to control it, my experience (and the Scriptures) tell me that we do have a great deal to do with it. We are able to focus our minds, and we ought to focus our minds on that which is positive. We can refuse to think about negative things, at least to some degree.