1 Corinthians: 2 9-10

9. But as it is written, Eye hath not seen, nor ear heard, neither have entered into the heart of man, the things which God hath prepared for them that love him

10.But God hath revealed them unto us by his Spirit: for the Spirit searcheth all things, yea, the deep things of God.

The overriding message seem to be that it is impossible to imagine Heaven  unless it is revealed to you by The Holy Spirit