Please, Tell me about

[annabanana]

1. I think it's this:

The past is done, and cannot be undone. Dwelling too much on it can keep someone from doing the right thing right now because you think it'll be just like the past.

The future is never what we expect it to be, and when we worry to much about tomorrow (and the tomorrows after that) it just plain looks too big to fix, and hopelessness can set in.

Another way of saying this is to encourage someone just to do "the next right thing" (another AA saying).

Someone suffering an addiction has a lot on their plate, and it can take every ounce of energy they possess to make just today not a train wreck.