 Fixing just upon this conception of agency, how might determinism pose a threat to free will? If determinism is true, then what happened in the distant past, when combined with the laws of nature, is causally sufficient for the production of every human action. But if this is so, then, while it might be true that an agent herself is crucially involved in the production of her action, that action actually has its source in causal antecedent that originate outside of her. Hence, she, as an agent, is not the ultimate source of her actions.