What is the aim of using your own declarations while proving a person’s state of mind?

Using your own declarations while proving a person’s state of mind primarily serves to illustrate mental capacity. This is important in legal contexts because a person’s mental state can significantly affect their ability to make decisions, understand situations, or engage in contractual agreements. By presenting your own declarations about another person's state of mind, you can effectively shed light on their cognitive and emotional functioning at a specific time.

For instance, if there are statements that reflect how someone was feeling or thinking during a critical event, this evidence can clarify their intent, understanding, or lack thereof in that moment. It becomes crucial in cases where mental capacity is in question, as it can establish whether the individual was capable of making informed choices.

The other options, although relevant to the broader conversation about legal declarations and evidence, do not directly address the specific aim of using one’s own declarations to substantively demonstrate the mental capacity of another individual.