At the end of the day, a person has many thoughts to run through their mind. Thoughts of home, of family, of responsibilities, of the future. But some have thoughts of the past. These thoughts can sometimes stray to the past. Thoughts of past love, past experiences, and past mistakes. But the dangerous thoughts are the ones that lead to the future. Plans for future success, events or even dreams. These thoughts can cause a person to lose focus if they are not careful.
A wise man once said "Focus on the present for it is exactly that: a gift." Focus on the here and now, plan your moves carefully, and do not let ambition cloud your judgement.