Who said "The world's rejection was my greatest teacher."?

This quote is attributed to Penguin.

The world's rejection was my greatest teacher. - Penguin

"The world's rejection was my greatest teacher."

Penguin Education

"I am not a human, I am an animal. A cold-blooded animal."

"You poor, unfortunate fool."

"Life's a bitch, isn't it?"

"I've been dead once already. It's not so bad."

"Education opens doors."

"Education opens doors to endless possibilities."

"I ain't got the education you got, bub."

"You can't put a price on history."