Regardless I love his prose

“Self-clos’d, all-repelling. What Demon
Hath form’d this abominable Void,
This soul-shudd’ring Vacuum?”

“The English poet-mystic William Blake said that as one starts into the spiral there is the possibility of falling from the golden track into eternal death. Yet it is only a crisis of a moment—a crisis of passage—and the whole purpose of shamanism and of life correctly lived is to strengthen the soul and to strengthen the ego’s relationship to the soul so that this passage can be cleanly made. This is the traditional position.

“I want to include an abyss in this model—one less familiar to rationalists, but familiar to us all one level deeper in the psyche as inheritors of the Judeo-Christian culture. That is the idea that the world will end, that there will be a final time, that there is not only the crisis of the death of the individual but also the crisis of death in the history of the species.

“…it is a mad rush from hominid to starlight… energies are released, religions are shot off like sparks, philosophies evolve and die, science arises, magic arises, all of these concerns that control power with greater and lesser degrees of ethical constancy appear. Ever present is the possibility of aborting the species’ transformation into a hyperspatial entelechy.”

The last section of Blake’s “Book of Ahania” also contains what one might consider a firm warning along these lines.