User blog comment:JERealize/Progress Bar: Issue 004/@comment-5931267-20130401164128/@comment-5931267-20130401174118

Only one Quote per story per nominator. In other words, two people could each nominate a Quote from Story X, but one person may not nominate two Quotes from it. One person could, however, nominate one Quote from Story X and one Quote from Story Y.

This is the only Quote limiting rule dude, you're free to nominate the same quote agian cause it follows the theme :)