Quote Source

[Pedro]

There's not many books referenced in this novel. However, I tried searching for the source for one quote supposedly from a Western book:

“Let’s say good-bye then,” he started to say, but his voice quavered and broke, and tears forced their way out and ran down the wrinkled cheeks. “I’m damned if I’ll cry!” he sobbed and threw out his great belly, “but it’s like saying goodbye to one’s own flesh and blood. I felt as though you were my own.”

Maybe it's the original Japanese text translated into English and not the original quote. Or maybe it's an excerpt lifted from an imaginary book.

Does anyone know?