Jane Eyre by Charlotte Brontë Chapter 34 Page 53

“I am ready to go to India, if I may go free.”

“Your answer requires a commentary,” he said; “it is not clear.”

“You have hitherto been my adopted brother — I, your adopted sister: let us continue as such: you and I had better not marry.”

He shook his head.

“Adopted fraternity will not do in this case. If you were my real sister it would be different: I should take you, and seek no wife. But as it is, either our union must be consecrated and sealed by marriage, or it cannot exist: practical obstacles oppose themselves to any other plan. Do you not see it, Jane? Consider a moment — your strong sense will guide you.”