Who said "We must be more careful."?

This quote is attributed to Squealer.

We must be more careful. - Squealer

"We must be more careful."

Squealer

Character in Animal Farm

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"Some animals are more equal than others"

"Surely there is no one among you who wants to see Jones come back?"

"The whole management and organization of this farm depend on Comrade Napoleon"

"Four legs good, two legs bad"