If I am not mistaken, Dijkstra advocated for Haskell to be used as a language of instruction at universities. There is an essay somewhere online about it. What I could find is this: [1].
Edit: Indeed, the PDF that is linked to in [1] looks like a scan of the original. [2]
[1] https://chrisdone.com/posts/dijkstra-haskell-java/
[2] http://www.cs.utexas.edu/users/EWD/OtherDocs/To%20the%20Budg...