By Msgr. Charles Pope - The word lust is most often used to refer to excessive or disordered sexual desire. However, because it is rooted in the Latin word luxuria (which refers to extravagant, excessive, or even riotous behavior), we sometimes hear it used in other ways. For example, someone may be said to have a “lust for power.” In the realm of moral and spiritual theology, though, we have come to restrict the word to sexual matters. This is especially because we have specific words to describe such excesses gluttony and greed.