The Unspoken Word is devoted to the pursuit of ultimate arcane power. Members believe that laws and moral concerns should never stand in the way of knowledge. Just as the Guild of Moonlight and Whispers seeks to unlock the mysteries of the fey, the Unspoken Word strives to master the powers of dragons, overlords, and daelkyr. Its members are determined to unravel the secrets of the Du’raskha Tul, the moon-shattering magics of the giants, and more. What has allowed this order to survive when similar groups—such as the Closed Circle of Breland—were destroyed is the absolute insistence that such magic should never be USED: that these words will forever remain unspoken. Unspoken mages insist that fear cannot be allowed to stand in the way of progress. But an Unspoken wizard pursuing the moon-breaking magic of the giants will insist that they have no desire to shatter moons; it’s simply that if such powers can be understood, could we use them in positive ways?
Members of the Unspoken Word are often viewed with a trace of fear, and most enjoy this infamy. They like to imply that they have dreadful secrets locked away in their vaults, fell powers they could unleash if they choose to. But again, they continue to exist because they never have caused disasters… and because their members are mages of considerable skill. While most are wizards, they accept Fiend and Great Old One Warlocks, provided they are proficient in Arcana and devoted to the pursuit of arcane science.
Source: http://keith-baker.com/ifaq-wizard-circles/