Who said "You should be grateful for the mercy of a swift end."?

This quote is attributed to Chitauri.

You should be grateful for the mercy of a swift end. - Chitauri

"You should be grateful for the mercy of a swift end."

Chitauri Gratitude

"We are inevitable. Your resistance only delays the unavoidable."

"You cling to hope, but hope is merely an illusion for the weak."

"Surrender now and your suffering will be brief."

"We consume worlds. Your world is next."

"Gratitude makes life richer."

"A grateful heart is a happy heart."

"Respect those who came before us."

"Life's greatest treasures are the people we love"