Who said "The strong are harder to kill than the weak."?

This quote is attributed to Thanos.

The strong are harder to kill than the weak. - Thanos

"The strong are harder to kill than the weak."

Thanos Strength

"I am inevitable."

"The hardest choices require the strongest wills."

"Perfectly balanced, as all things should be."

"You should have aimed for the head."

"Strength comes from within."

"A woman should be proud of who she is."

"A strong woman can overcome anything."

"The only thing I'm good at is killing."