Edgar Cayce (Known, at the time, as "the sleeping prophet") was also known for accessing the data stream. He made predictions of future changes as well, and While many of his predictions did come true, people always questioned why SOME of his predictions did not come true. He always had the same answer. That the predictions were based on the probable choices at the time, and some choices were different than expected, therefor changing the "probable" future.
The above is essentially true, but you also have to factor in how much Cayce's info has been mythologized and misinterpreted. I use to read a lot of Cayce, first books written about his info, and then later directly researching the Readings themselves. I often found discrepancies between people's interpretations of what he was saying, and what i actually read of what he (his guidance rather) actually said.
A good example is the (in)famous "Pole shift" reading, wherein a person asks, "What great change or the beginning
* of what change, if any, is to take place in the Earth in the year 2000 to 2001 A.D.?" The answer given, much like the question asked, was a relative and general one: ""When there is the shifting of the poles; or a new cycle begins." *my use of bold
Yet, so many Cayce authors, researchers, etc. came out and said "Cayce said there would be a pole shift by the end of 2001." Clearly, if the question and answer
is read carefully and in context, this is not what was stated. There was no definite this or that given.
I've seen various examples of this in connection with this work. What Cayce's guidance did do, however, was to outline certain general trends and periods. For an example, the time period and dates most mentioned in this work is the 40 year testing period from 1958 to 1998 wherein a few things were said to begin
during this time. An increase in general global temperatures and climate changes--particularly near the polar regions, incidences wherein more "Lights" would be seen in the clouds and skies (UFO's?), a burgeoning spiritual, more universal type consciousness, and the beginning of the geological changes such as increase in frequency and severity of Earthquakes, volcanoes, etc.
The increase in global temperatures, earthquakes, volcanism, etc. seemed to be linked to a an "upheaval" that happened deep within the Earth (The Earth's inner and independently rotating core?) during the year 1936, which was hinted at beginning a gradual but eventually catapstrophic
process of geological change within the Earth. Indeed, the changes at the year 1998 were forecasted by this source to still be considered "gradual" at this point.
In this, we see more accuracy in the Cayce work (and quite a long time ago) than with most of the explorers working with Monroe except for Rosiland McKnight.
Btw, it's interesting to note that Cayce's guidance said that for that upheaval deep within the Earth during 36 changed the axis position in relation to Polaris the North star. Casual researchers then and now, have linked this axial change to the outer poles we are familiar with, yet it's hinted that this axial change had to do with the inner core rather than the outer poles we normally observe and think about. We know scientifically that it was NOT the outer poles that Cayce's guidance was talking about because we are still pretty aligned with Polaris.
Scientific researchers have recently discovered that the inner core of the Earth is indeed an independently rotating mass within the Earth--specifically sort of a giant crystal, and that it's north-south axial position is shifted about 10 degrees from the outer poles of the Earth (and thus also from Polaris the north star).
(unfortunately, not a lot of the above is "spelled out" in the Cayce readings, and i had to exercise my own intuition and attunement to Guidance to work a lot of it all out in the cohesive, coherent form it's now in---or in other words, more interpretation ; ) ).