See The Ra Material - The Law of One (Channelled between 1981 and 1984)
6.15 Questioner: What is the length, in our years, of one of these cycles?
Ra: I am Ra. One major cycle is approximately 25,000 of your years. There are three cycles of this nature during which those who have progressed may be harvested at the end of three major cycles. That is, approximately between 75,000 and 76,000 of your years. All are harvested regardless of their progress, for during that time the planet itself has moved through the useful part of that dimension and begins to cease being useful for the lower levels of vibration within that density.
13.22 Questioner: What is the density level of our planet Earth at this time?
Ra: I am Ra. The sphere upon which you dwell is third density in its beingness of mind/body/spirit complexes. It is now in a space/time continuum, fourth density. This is causing a somewhat difficult harvest. [ie earth changes - Messenger Spirit]
43.25 Questioner: On this planet after the harvest is complete, will fourth-density beings be incarnate on the surface as we know it now?
Ra: I am Ra. The probability/possibility vortices indicate this to be most likely.
82.12 .........Ra: I am Ra. The lessons of third density are predestined by the very nature of the vibratory rates experienced during this particular density and by the nature of the quantum jump to the vibratory experiences of fourth density.
[underlined by Messenger Spirit]
The end result is assured - the Earth and Humanity will graduate to a higher density/dimension. A vastly greater power than we can currently comprehend is guiding this process to its now inevitable - positive - conclusion.
There will be difficult times ahead for some, but we must remember that we each chose to be here at this time - and were chosen from amongst many who were unsuccessful - to play our part and to go through this transition. We are spiritual beings temporarily residing in physical bodies, expressions of the One Infinite Creator experiencing and expanding the Creation. It is our spiritual goal to evolve and grow towards a re-union with our Source - the One Infinite Creator, All That Is.
As Einstein said: