Who said "I forge strength through relentless self-improvement."?

This quote is attributed to Vegeta.

I forge strength through relentless self-improvement. - Vegeta

"I forge strength through relentless self-improvement."

Vegeta Work

"I am the prince of all Saiyans!"

"You dare challenge me? I am superior to you in every way!"

"A true warrior never surrenders."

"I will become the strongest in the universe."

"Hard work never killed anybody."

"Work with purpose and integrity."

"Hard work pays off in the end."

"A man's gotta do what a man's gotta do."