system
Given the following post, respond as if you're commenting on Reddit:
human
[General Fiction] how does omniscience works?

Like, it's necessary to also have the other "omni powers" to have it? Where is the line between omniscience and night-omniscience draw?
gpt
If you have omnipotence, you almost by definition have omniscience as well, or could at least *give* yourself omniscience.

Omniscience literally means "all knowledge," and by definition means you know *everything*; nothing is hidden from you. There are, however, a few different interpretations of this.

The first is the kind of omniscience you typically hear modern theologians talk about: a complete understanding of everything that was, is, and ever will be. You know how it all started, and how it will all end. This view of omniscience requires a deterministic universe, and precludes free will.

A second, lesser form of omniscience would involve knowledge of all that was and is, but introduces a random element to the universe, meaning you don't know *for sure* what will happen. However, your complete knowledge of all that was and is means your predictive powers would still be incredibly accurate.

There could also be a form of omniscience where you *could* know everything, but you need to actively seek out that knowledge to have it. For example, you *could* know how many blades of grass are on the White House lawn, but you wouldn't have that information in mind unless you actively wanted to. 

Nigh-omniscience would be anything less than one of these complete forms of knowledge. If there is *anything* you don't, or can't, know, you aren't omniscient.

Lastly, you can have a form of limited omniscience. Maybe you know absolutely everything that is happening on Earth, but not what's happening on Mars. This is referred to as *intellectus* in the *Dresden Files*.