Axe Elf
Prophet
Do you think that the Bible, among the various theistic scriptures that exist, does a good job of making God understandable? I will confess that that has not been my experience.
Probably no more so (nor any less so) than other theistic scriptures. God makes God understandable, to the extent that He reveals Himself. Comparing personal experiences with the experiences of others via the various scriptures is one way of corroborating that you're on the right track, and can help you put into words things that might otherwise remain ineffable.
For instance, if your experience of that which we call a tree is pretty similar to other experiences of people who have experienced what they are calling a "tree," then you not only have a word to assign to your experience ("tree"), but you can be more confident that your experience reflects some kind of objective reality, and is not just some hallucination or illusion. But if you were to just read about a tree, without any personal experience of one, you might not really understand the full essence of "tree-ness".
So the various descriptions of divine experiences related in the scriptures of the world are not necessarily illuminative in and of themselves, but they can help make similar personal experiences of God (by whatever name one calls Him) understandable.