Related Clues:

• The classical way to have been lying about tea
• Thomas turned to the maxim
• The French 27 across is not in French
• The French can be not in French
• An old tongue was lying about a little tea
• "Don't tread on me," e.g
• Like many mottoes
• Inspirational slogan
• Hogwarts motto language
• Saying what that beast said about a non-drinker
• Julius Caesar's language
• With 42-Across, one who might memorize 64-Across?
• Source of much legalese
• Language for legal terminology
• Guiding phrase