Who said "The past cannot be changed, only understood."?

This quote is attributed to Swamp Thing.

The past cannot be changed, only understood. - Swamp Thing

"The past cannot be changed, only understood."

Swamp Thing Time

"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."

"Time waits for no one."

"Time spent with loved ones is never wasted."

"I've been alive for a long time. Long enough to know that you can't trust anyone."

"The past always catches up with you."