I’m pretty sure you all remember that famous Lost episode called The Constant. The episode where we see Desmonds consciousness shift back to 1996 where he is told by Daniel that he needs a constant to survive, and Penny is his constant.
After Desmond saves himself Daniel finds his notebook and reads a page that says “If anything goes wrong, Desmond Hume will be my constant”.
Ok, so this message in Daniels notebook: did it appear after Desmond had saved himself (ie after his visit to Daniel in the past), or was it there all along? And if it was there all along, why didn’t Daniel remember it?
If there isn’t such a thing as changing the past then surely the message would have been there all along?
But then Desmond meets Mrs Hawking, the woman who tells him about course correction. No matter how you try and change things the universe has a way of course correcting.
So, now we have a dilemma. We have a scenario where you can’t change the past or the future and that Daniels notebook had that message in all along; or you can change things in the past but no matter what things will course correct to your destiny.
What I believe is that the message was always there BUT if Desmond hadn’t gone back to his 1996 consciousness the universe would’ve found another way for the message to be there, and Daniel has a loss of memory about the meeting because really it hadn’t happened to him… yet.
I hope that makes sense!