Who said "The universe is grateful for my actions."?

This quote is attributed to Thanos.

The universe is grateful for my actions. - Thanos

"The universe is grateful for my actions."

Thanos Justice

"I am inevitable."

"The hardest choices require the strongest wills."

"Perfectly balanced, as all things should be."

"You should have aimed for the head."

"Justice must always prevail."

"You think I'm just some animal?"

"Fighting for what's right never gets easier."

"Justice is worth fighting for."