The right train of thought can take you to a better station in life. (Unknown)
What you focus your mind on will not only pretty well determine the direction of your life but also its ultimate goal. One thought leads to another and that to another; they are all linked together—thus the train imagery. It is critical that we learn from a young age not only how to think but what to think about—what to focus our thoughts on.
Whatever is true, whatever is noble . . . right, . . . pure, . . . lovely, . . . admirable—if anything is excellent or praiseworthy—think about such things (Philippians 4:8).