In the future, I highly recommend sourcing to Wikiquote instead. It’s a sister project of Wikipedia which sources its quotes so they can be independently verified, whereas Goodreads just operates on an ad populum approach of upvotes. It also for this reason tends to be more robust to error, and many more prominent figures have specific sections both for popular quotes that are known to be misattributed and for ones that are dubious but not currently falsifiable.