Who said "Death is final, which is why every moment matters."?

This quote is attributed to Hawkeye (Age of Ultron).

Death is final, which is why every moment matters. - Hawkeye (Age of Ultron)

"Death is final, which is why every moment matters."

Hawkeye (Age of Ultron) Death

"It's not what you can do, it's what you will do."

"We're not soldiers. But I've seen worse than this before."

"Family is everything. That's why I fight."

"Sometimes the hardest thing and the right thing are the same."

"Death doesn't scare me anymore."

"Death and I are old friends."

"Welcome to my world."

"Death is just the beginning."