looking back on the past
In a retrospective mood, he regretfully considered the many injuries he had unintentionally done to people over the years.
retro (back)#specere (to look at) (Latin)
Retro: past and spect: is to see so retrospective is to look ack in past Prefix Retro:Behind, past. -spect. just adding "in" to -spect. it becomes inspect. thus inspecting our past, looking back at our past.