Do this passage in your opinion speaks about the inner world one find during meditation?
"There is a mountain situated in the midst of the earth, or center of the world, which is both small and great. It is soft, also above measure hard and stony. It is far off, and near at hand, but by the providence of God, invisible. In it are hidden most ample treasures, which the world is not able to value. This mountain by envy of the devil, who always opposeth the glory of God and the happiness of man, is compassed about with very cruel beasts and other [sic] ravenous birds, which make the way thither both difficult and dangerous; and therefore hitherto, because the time is not yet come, the way thither could not be sought after nor found out. But now at last the way is to be found by those that are worthy, but notwithstanding by every man's self-labor and endeavors... "The earthquake being past, there shall follow afire, that will consume the earthly rubbish, and discover the treasure, but as yet you cannot see it. After all these things and near the daybreak there shall be a great calm, and you shall see the Day-Star arise and the dawning will appear, and you shall perceive a great treasure. The chiefest thing in it, and the most perfect, is a certain exalted tincture, with which the world (if it served God and were worthy of such gifts) might be tinged and turned into most pure gold.
The passage refers to nothing but the self, which is the essence of everything and nothing. En route to reaching the self, various temptations (such as siddhi-s & their offerings) greet the Yogi. The wise Yogi however stays clear of these, ever intent on the final goal. The cruel beasts and birds are the ignorance present within man, which one encounters every minute as impediments to practice.
The Earthquake refers to the various upheavals & downfalls one encounters in practice. One finally wins over these by the grace of the Lord which shines further to unswerving self-effort. The fire which consumes the rubbish is the fire of self-knowledge which consumes the rubbish of ignorance around the Atman. Though almost one with the self, yet some impeding Vasana-s still exist (refers to the state just before the 'Dharmamegha Samadhi'). When the Yogi finally crosses this state, he attains 'Kaivalya' (self-realization) which is the ever luminous Day-Star, matchless in shine.
ॐ तत् सत्
(That Supreme being is the absolute truth)