Who said "There is no failure except in no longer trying."?

This quote is attributed to Samuel Hamilton.

There is no failure except in no longer trying. - Samuel Hamilton

"There is no failure except in no longer trying."

Samuel Hamilton Perseverance

Character in East of Eden

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"Some people are born to lift the world up a little when they come into it."

"I love the world. I love people."

"Do you know what I believe? I believe that every man is responsible for his own soul."

"A man is not beaten until he wishes to be."

"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."