Who said "What is death but a return to the earth from which we came?"?

This quote is attributed to Swamp Thing.

What is death but a return to the earth from which we came? - Swamp Thing

"What is death but a return to the earth from which we came?"

Swamp Thing Death

"I am the swamp. The swamp is me."

"What was I? What am I now?"

"The man I was is gone. Only the swamp remains."

"They made me into this... this thing."

"Death doesn't scare me anymore."

"Death and I are old friends."

"Welcome to my world."

"Death is just the beginning."