Pilgrim's Progress §84: Now, said Christian, let me go hence.

Now, said Christian, let me go hence. Nay, stay, said the Interpreter, till I have shewed thee a little more, and after that thou shalt go on thy way. So he took him by the hand again, and led him into a very dark room, where there sat a man in an iron cage. Now the man, to look on, seemed very sad; he sat with his eyes looking down to the ground, his hands folded together, and he sighed as if he would break his heart. Then said Christian, What means this? At which the Interpreter bid him talk with the man. Then said Christian to the man, What art thou? The man answered, I am what I was not once.