Just about all of our thoughts have to do with either 'forward' time: upcoming vacation, payday, what to have for dinner, pick up kids from school, schedules, appointments, deadlines etc.
Or 'past' time: longing for happier times in your youth, trouble releasing hurts and pain that happened before. This has the effect of 'removing' us from the moment, and being stuck in forward or past times. Dismissing thoughts, teaches you to be here, in the present. This is the goal. Be here now. Exist in the moment. This will allow you to experience the Perfect Moment. Connection. Understanding. Peace.