RIght, we don't have the requisite secret decoder rings so we can not climb into the tree house..
It's not like that. All one needs to do is contemplate and ponder on the Words of God with an open and unbiased mind.
With a humble posture of learning we can understand many things.
It's like the mountain and the river.
The mountain stands tall and proud and the river sits lowly but the water all flows into the river.
Truth is like that. If we are proud it truth deserts us because if we are full of ourselves there is no room for learning,. We have to empty our prejudices and biases and approach with an open and unbiased mind to learn.
Scientists question but there a point where they accept truth. If they always said 'no that can't be true ' we would still be riding on donkeys.
If we think we are right and everybody is wrong then we can't learn anymore. We become closed to all truth.