Thomas Aquinas,
Summa Theologiae — Question 42 - OF THE OBJECT OF FEAR…
“ Because things that exist in time are measured, in a way, according to the duration of time: wherefore if it be an evil to suffer something for a certain length of time, we should reckon the evil doubled, if it be suffered for twice that length of time. And accordingly, to suffer the same thing for an infinite length of time, i.e. for ever, implies, so to speak, an infinite increase. Now those evils which, after they have come, cannot be remedied at all, or at least not easily, are considered as lasting for ever or for a long time: for which reason they inspire the greatest fear. ”
