The Early Sessions, Book 9

"The race also realizes well the advantages and disadvantages of the physical reality it has adopted. It knows for example that there is a tendency to go extremes. I mentioned earlier that the rewards, the challenges and the dangers exist precisely because so much freedom is allowed. Now. Those within the system know this. Regardless of what you may think of their present performance at any given "time" in quotes, it is from this system that the greatest potentials emerge; for having dealt with it, consciousness undergoes one of the severest tests in learning to handle its own energy. The horror and the results of mismanagement, and the vulnerability, are the teaching methods that each consciousness has accepted before entering your system. There is no way out but to learn or to ruin the entire system. In no other field of reality are the terms so drastic. For this reason the inner self withholds much of its knowledge. There must be no leaning upon the very basic fact that behind and within the system there is relief. You must believe in the physical reality and accept the vulnerability."

Session 498, Page 370