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«If we are the only ra­tio­nal be­ings in the Uni­verse, as some re­cent ev­i­dence sug­gests, it mat­ters even more whether we shall have de­scen­dants or suc­ces­sors dur­ing the billions of years in which that would be pos­si­ble. Some of our suc­ces­sors might live lives and cre­ate wor­lds that, though failing to jus­tify past suffer­ing, would have given us all, in­clud­ing those who suffered most, rea­sons to be glad that the Uni­verse ex­ists.» — Derek Parfit