Passage Summary: A promise is a deal you have to keep unless the person you promised says it's okay to skip it, or if something totally out of your control makes it impossible to do.

Reasoning: The passage defines a promise as an obligatory agreement and lists two exceptions for breaking it: permission from the recipient or inability to perform due to external factors.

Analysis: To apply this principle correctly, we need a scenario that matches the definition of a promise and then correctly invokes one of the two 'escape' conditions. The answer should describe a specific situation where someone is justified in not fulfilling an obligation. Be careful to ensure the reason for breaking the promise fits perfectly into 'permission' or 'uncontrollable circumstances.' If someone breaks a promise just because they changed their mind or found a better deal, they haven't followed the principle.