A more thorough explanation:

Definition: A self-serving declaration is a statement made by someone that benefits themselves or their own interests. It may not be entirely truthful or objective. Example: A politician claiming that they have never taken bribes, even though there is evidence to the contrary. Explanation: The politician's statement is self-serving because it benefits them by denying any wrongdoing. However, it may not be entirely truthful or objective because there is evidence that suggests otherwise. Example: A student claiming that they studied for hours before a test, even though they didn't. Explanation: The student's statement is self-serving because it benefits them by making it seem like they put in effort to prepare for the test. However, it may not be entirely truthful or objective because they didn't actually study.