I have seen the dark universe yawning Where the black planets roll without aim, Where they roll in their horror unheeded, Without knowledge, or lustre, or name.

It was from the artists and poets that the pertinent answers came, and I know that panic would have broken loose had they been able to compare notes.

The most merciful thing in the world, I think, is the inability of the human mind to correlate all its contents... some day the piecing together of dissociated knowledge will open up such terrifying vistas of reality, and of our frightful position therein, that we shall either go mad from the revelation or flee from the light into the peace and safety of a new Dark Age.

To the scientist there is the joy in pursuing truth which nearly counteracts the depressing revelations of truth.

I could not help feeling that they were evil things -- mountains of madness whose farther slopes looked out over some accursed ultimate abyss.

Bunch together a group of people deliberately chosen for strong religious feelings, and you have a practical guarantee of dark morbidities expressed in crime, perversion, and insanity.

That which we call substance and reality is shadow and illusion, and that which we call shadow and illusion is substance and reality.