Here Kipling is advising his readers to not pay attention to the way people will change your words to fool others. A knave is an untrustworthy person, and Kipling makes sure the reader understands what the knave is doing by using such words as "twisted", and "trap". Both words bring about very clear images in a readers mind of lying and tricking. Also Kipling includes the fact that the people who are trapped by the knave are "fools." This warns the reader not to be trapped by these liars because when one is trapped he becomes a fool. A smart man must not let a knave's misrepresentation of his words get to him, and must also not allow himself to be fooled.