Since you already have a number of "cause and effect, first cause" threads going, time to lock this one.A deva in the sphere of the unconscious who having a perception immediately falls from that
existence to another. Recalling the past existence, but no other wrongly feels that there is
a first cause, a first existence.
Digha Nikaya 1"there is no first beginning, no first beginning is knowable"
Samyutta Nikaya 15.1-2