Take death, for example:
And often consider it's intrusion a tragic event.
We make extraordinary efforts to delay it,
A great deal of our effort goes into avoiding it.
It gives importance and value to time.
Death gives meaning to our lives.
Yet we find it hard to live without it.

If death were indefinitely put off, the human pshyche would end up,
Time would become meaningless if there were too much of it.
~excerpt from~
When computers excede human intelligence
Well, like the end of a twilight zone episode.
By: ray kurzweil
The age of spiritual machines: