In order to give an example of ho a memory is a truth, one needs to understand the meaning of truth.
A truth is defined in many different ways. Dictionary.com defines truth in the following ways:
1. the true or actual state of a matter: He tried to find out the truth. 2. conformity with fact or reality; verity: the truth of a statement. 3. a verified or indisputable fact, proposition, principle, or the like: mathematical truths. 4. the state or character of being true. 5. actuality or actual existence.
To provide an example of how a memory can be a truth, examine the following scenario: A man and woman are talking about their vacation. They both proceed to recall (bring forth a memory) the things that they did on vacation. They agree on everything but one thing: one believes that they went to the beach on Friday and the other believes that they went to the beach on Saturday. Each swear that the day they went to the beach as an "indisputable fact." Here, the memories are very different. Each swear that they are right. While the belief exists, neither are willing to back down from what they know to be true.