I've cleared out a storage unit and am going through old papers, etc. Happily, I found an extensive letter from Edsger Dijkstra to my 19 year old self. The scan is here: https://levien.com/dijkstra-letter.pdf
This is in response to my somewhat juvenile ideas of explicit continuation passing style and lambda lifting with a sprinkle of communicating sequential processes thrown in. That paper, for reference, is https://dl.acm.org/doi/pdf/10.1145/70931.70934
I'm still amazed at how generous Dijkstra was with his time.