Who said "He must work harder still."?

This quote is attributed to Boxer.

He must work harder still. - Boxer

"He must work harder still."

Boxer Perseverance

Character in Animal Farm

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"I will work harder"

"Surely there is no one that works harder than I do"

"Napoleon is always right."

"I will work harder."

"Perseverance is the key to success."

"Don't give up on what you believe in."

"I've been through worse."

"You learn to live with the pain."