Entropy and Memory

From Eternity to Book Club: Chapter Nine》 says:
Namely, the reason why we can “remember” the past and not the future is that the past features a low-entropy boundary condition, while the future does not.
It’s hard for people to wrap their brains around the fact that, without such an assumption, our “memories” or records of the past will generally be unreliableknowledge of the current macrostate wouldn’t allow us to reconstruct the past any better than it allows us to predict the future.