Life is filled with friendly reminders.
A few weeks before your car needs a check-up, you get a postcard in the mail. A few days before a doctor's visit, you get a call from the receptionist.
If you're like me, 99 out of 100 times you don't really need the friendly reminder. But that one other time, the time you forgot to add the appointment to your calendar, the friendly reminder becomes something much more.
Figuratively speaking, it's a life saver.