" When I consider the brief span of my life, swallowed up in the eternity before and behind it, the small space that I fill, or even see, engulfed in the infinite immensity of spaces which I know not, and which know not me, I am afraid.'
'I should think so' I said.
'I am afraid, sir, and wonder to see myself here rather than there. For there is no reason why I should be here rather than then'
'Did you come to any conclusion?'
The Stanton cleared its throat, then got out a folded linen handkerchief and carefully blew its nose. 'It seems to me that time must move in strange jumps, passing over intervening epochs. But why it would do that, or even how, I do not know. At a certain point the mind cannot fathom anything further. "

― Philip K. Dick , We Can Build You