Time is the school in which we learn,
Time is the fire in which we burn.
– Delmore Schwartz, “Calmly We Walk through This April’s Day”
https://www.poetryfoundation.org/poems/42633/calmly-we-walk-through-this-aprils-day
Discussion
(Also quoted by Dr. Soran in Star Trek: Generations, an underrated film.)