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> What do you mean this knowledge cannot be used?

The knowledge will not be able to affect the outcome of your present, past, or future.

> ...but I don’t see how it is possible for me not to use that knowledge.

I don't see how it is possible for you to gain omniscience either.

No, I mean, if I know my future it would definitely affect my actions. Does this mean I'm "using" this knowledge?

> Does this mean I'm "using" this knowledge?

Yes

> ...if I know my future it would definitely affect my actions

Not if I, as the originator of the question, say it cannot.

Can you explain? Do I lose free will or something?

Free will does not exist

If we have knowledge of something, there is no way that it could not impact our behavior. The brain just doesn't work like that