Most of the things we know are limited to what is perceived by the five senses.. touch, sight, taste, hearing and smelling.

Imagine if knowledge of men can be unlimited by space.

The most interesting one is knowledge unlimited by time. Most important of that is the certainty of a future event. Imagine mourning your dead relative months or years before they are gone. It would bring alot of distress. But it must be comforting because one would at least be comforted by the persons they mourn, have an opportunity to appreciate them. It would be a coping mechanism that was set in action long before the day of distress.

That is what makes the gift of knowledge by the Spirit of God one of the greatest gifts to be desired.