What does it mean to take 'one day at a time' in a 12 step organization?

What does it mean to take 'one day at a time' in a 12 step organization?

It's just realizing that the only reality that humans have is in the moment; that anything else is an illusion. When we get caught up into memories, or memories of the past, or fantasies of what the future is going to be, we're not living in the moment, and the moment is all that's real. As soon as we move into either of those realms, and we would say we're planning and everything. But the thing is, we're dealing with an illusion, and the problem with an addiction is that once you start to think about tomorrow, you can think about every tomorrow for the next 5 years, for the next 30 years, for however long. You can get caught up into a fantasy that may never come to be. The one day at a time is like, Okay, come back to your senses. What are you seeing? What are you smelling? What are you hearing? This is what's real. Not all of this other stuff, not all of these stories you tell yourself about who you are, and what life should be, or what life shouldn't be, or how you've been abused by life, or how you're going to make it big. Do what you can during the day, but realize that the only reality is right now and all I have to deal with is right now, because everything else is a fantasy or a memory.