GOD AND DRUGS
As a tadpole swims around in a pond it can see the frog hopping around on dry land but it cannot understand the experiences and perceptions of the frog. And the frog on land knowing a different world than the tadpole will understand the majority of the tadpoles experience having been there once. But neither will ever completely understand each other. One exception being a frog being able to access "notes" ("" denotes for lack of a better word) it had taken while experiencing what the tadpole does. The other exception being a tadpole channeling a frog perspective and access to its knowledge while knowing all it already knew.