The poet Rilke made a dogged effort to capture every last little thing he encountered in life without deciding in advance its ultimate significance. He wrote out each "assignment" dealt to him by life in order not to miss anything the next time around.
"The longer I live, the more urgent it seems to me to endure and transcribe the whole dictation of existence up to its end, for it might just be the case that only the very last sentence contains that small and possibly inconspicuous word through which everything we had struggled to learn and everything we had failed to understand will be transformed into magnificent sense." From his letters.
A reason to keep a diary or journal even if full of the greatest trivia.