Who said "You made a grave mistake."?

This quote is attributed to Green Goblin.

You made a grave mistake. - Green Goblin

"You made a grave mistake."

Green Goblin

"Out, am I?"

"You know how much you've sacrificed to fight me? Everything! But the cunning warrior survives by admitting what he is."

"The cunning warrior survives by admitting what he is."

"I'm something of a scientist myself."