Why couldn't Dopey speak?

Dopey is the famously mute character in Snow White and the Seven Dwarfs, but this wasn't always the case. You see, initially, the script had many lines for him.The studio even hired famous voice actor Mel Blanc (the voice of Bugs Bunny and Daffy Duck) to bring Dopey to life. However, it just wasn't meant to be.Walt Disney, unhappy with the recording, cut ALL of Dopey's lines. Mel Blanc's voice is only audible whenever Dopey hiccups.