Technically, I suppose, it was Archilochus: "The fox knows many things; the hedgehog one great thing."

Tetlock seems to have a slightly different interpretation to Berlin - (paraphrased from [1]) "hedgehogs have one grand theory; foxes are skeptical about grand theories".

[1] https://longnow.org/seminars/02007/jan/26/why-foxes-are-bett...

One thing to note is that Berlin does not consider the fox as all around better than the hedgehog. Usually you'll see that people have a preference for the fox but Berlin considers some great people as hedgehogs such as Plato, Nietzsche, and Dostoevsky. He also stresses the fact that it's merely a metaphor and shouldn't be applied strictly.

The book is absolutely worth a read if you're into the subject.