Who said "Constant training is the path to true power."?

This quote is attributed to Vegeta.

Constant training is the path to true power. - Vegeta

"Constant training is the path to true power."

Vegeta Perseverance

"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."

"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."