Emphasis in a quotation

When readers see emphasis in a quotation, they don't know whether it was already there or was added by the quoter. Here's how to handle these cases:

　　Locke argues that every individual in the state of nature has a right to enforce the laws of nature: "the execution of the law of nature is, in that state, put into every man's hands . . ." （9, emphasis in the original）.

　　For Wollstonecraft, universal education is critical: "my main argument is built on this simple principle, that if she [woman] be not prepared by education to become the companion of man, she will stop the progress of knowledge and virtue; for truth must be common to all, or it will be inefficacious with respect to its influence on general practice" （86, emphasis added）.