Related Clues:

• Not fiction
• Principle
• Adage
• Words to live by
• If A = B and B = C, then A = C, e.g.
• You'd better believe it!
• Words of wisdom
• It's true
• 'Love thy neighbor' is one
• Datum
• Trite saying
• Accepted rule
• Saw
• It goes without saying
• Certainty