In Heaven, we’ll see clearly (1 Cor. 13:12), but won’t know everything. 

If we knew everything, we’d be God. To see clearly, with far greater understanding, is one thing, to see omnisciently is another. God alone is Creator, we are mere creatures. Only God is omniscient; we are and always will be finite. The popular notion “we’ll know everything in heaven” is therefore clearly wrong. When we go to heaven we become glorified humans, we don’t become God. The angels in heaven don’t know everything (Mark 13:32). Neither will we.

For more information on the subject of Heaven, see Randy Alcorn’s book Heaven.