Franklin contrasts a lie with the greater stability of truth. A lie “stands on one leg”, suggesting that it is inherently unsteady and vulnerable to challenge. Because falsehood does not correspond with reality, it may require further invention, concealment or contradiction to keep it credible. Truth, by contrast, “stands on two” because it has the support of what actually happened or what can be established.

The saying therefore presents truth as more durable than deception. A truthful account can remain consistent as circumstances change or further evidence appears, while a lie may collapse when it encounters facts that do not fit it. The image also carries a practical moral point: dishonesty can create continuing difficulties because one false statement may need others to sustain it. Franklin’s concise metaphor links truth with firmness and reliability, and falsehood with instability and the risk of eventual exposure.