Section 13.7 in the Spotlight
A good rule of thumb is that changes to quotations are not permitted, period. So much is at stake when we present the words of someone else, whether spoken or written, and responsibility lies with the quoter to render what was said accurately and in a fair context. The actual wording of the quotation must be reproduced exactly. Yet CMOS 13.7 lists half a dozen things that are OK to change when quoting.