Who said "I want to leave this world better than I found it."?

This quote is attributed to Goku.

I want to leave this world better than I found it. - Goku

"I want to leave this world better than I found it."

Goku

"I am the hope of the universe. I am the answer to all living things that cry out for peace."

"Even the strongest of opponents always have a weakness."

"I'm not fighting to win. I'm fighting because I have to."

"The difference between our power levels are like the difference between a firefly and the sun."