The consciousness in the ego makes a 180 degree turn away from the „non-existent“ future in the present and always comes back to the present. Therefore, in this state, it is unable to consider itself in the context of infinity or eternity. So it perceives only itself and its existence. In the narrow frame, existence is quasi-eternal and death and everything else outside the narrow circle of consciousness is non-existent.
The narrower the circle, the more egocentric the person. The perception does not even reach a few centimeters anymore. Nothing and nobody is included in this perception more than he himself.