If I had to pick three books that made me who I am, I would add Ask A Foolish Question by Robert Sheckley [0] and Hard to Be a God by Strugatsky brothers [1].

Those two are more about humility and imperialism than learning, though.

[0] https://www.gutenberg.org/ebooks/33854

[1] https://content.cosmos.art/media/pages/library/hard-to-be-a-...