Who said "I've invested too much to turn back now."?

This quote is attributed to Harvey Dent.

I've invested too much to turn back now. - Harvey Dent

"I've invested too much to turn back now."

Harvey Dent Perseverance

"The night is darkest just before the dawn."

"I believe in Harvey Dent."

"You either die a hero or live long enough to see yourself become the villain."

"Fairness is the foundation of justice."

"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."