Who said "Be grateful for the time remaining to you."?

This quote is attributed to Doomsday.

Be grateful for the time remaining to you. - Doomsday

"Be grateful for the time remaining to you."

Doomsday Gratitude

"I am the thing that darkness fears."

"Destruction is the only truth I know."

"You cannot stop what has already begun."

"I grow stronger with every battle."

"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"