Which Episode of Bleach is this quote from? / Help me cite this quote
Assuming that it is indeed on Chapter 237, then the episode you are looking for is Episode 141 titled Goodbye..., Kurosaki! which originally aired on September 19, 2007 while the English version aired later on August 15, 2009.

For future reference, the Bleach wikia, and most of the anime wikia, usually includes the chapter and the corresponding episode based on it while the Wikipedia pages of anime usually includes the list of episodes together with their air dates.