A.E. van Vogt, The World of Null-A, in the Triad omnibus page 39

Fear must derive from the very colloids of a substance. A flower closing its petals for the night was showing fear of the dark, but it had no nervous system to transmit the impulse and no thalamus to receive and translate the electric message into an emotion. A human being was a physico-chemical structure whose awareness of life was derived from an intricate nervous system. After death, the body disintegrated; the personality survived as a series of distorted impulse-memories in other people's nervous systems. As the years flew by, those memories would grow dimmer. At most, Gilbert Gosseyn would survive as a nerve impulse in other human beings for half a century; as an emulsion on a film negative for several score years; as an electronic pattern in a series of cathode-ray cells for perhaps two centuries. None of the potentialities diminished even fractionally the flow of perspiration from his body in that hot, almost airless room.

"I'm as good as dead," he thought in agony. "I'm going to die. I'm going to die."