Your own survival as a species was your main concern. You considered other species only in the light of their use to you. You did not have any true conception of the great sacredness of all consciousness, nor of your relationship within it. You were losing your grasp of that great truth.
In the present circumstances you are carrying that idea forward–of racial survival regardless of the consequences, the idea of changing the environment to suit your own purposes; and this has led you to a disregard of spiritual truths.
In physical reality, therefore, you are seeing the results. Now those personalities who are returning are doing so for various reasons. Some of them are drawn to physical life again because of these attitudes. They are those who in the past, in your terms, strove for physical existence without consideration for the rights of other species. They are driven to return because of their own desires.
The race must learn the value of the individual man. The race is also learning its dependence upon other species, and beginning to comprehend its part in the whole framework in physical reality.
Now: Some individuals are being reborn at this time simply to help you understand. They are forcing the issue, and forcing the crisis, for you still have time to change your ways. You are working on two main problems, but both involve the sacredness of the individual, and the individual’s relationship with others and with all physically oriented consciousness.
The problem of war will sooner or later teach you that when you kill another man, basically you will end up killing yourself. The over population problem will teach you that if you do not have a loving concern for the environment in which you dwell, it will no longer sustain you–you will not be worthy of it. You will not be destroying the planet, you see. You will not be destroying the birds or the flowers, or the grain or the animals. You will not be worthy of them, and they will be destroying you.
You have set up the problem for yourselves within the framework of your reference. You will not understand your part within the framework of nature until you actually see yourselves in danger of tearing it apart. You will not destroy consciousness. You will not annihilate the consciousness of even one leaf, but in your context, if the problem were not solved, these would fade from your experience.
The crisis is a kind of therapy, however. It is a teaching method that you have set up for yourselves because you need it. And you need it now, before your race embarks upon journeys to other physical realities. You must learn your lessons now in your own backyard before you travel to other worlds. So you have brought this upon yourself for that purpose and you will learn.” (Source – Seth Speaks Session:550)