 Philosophers who agree that trust can be rational (in a truth- or end-directed way or both) tend to disagree about the extent to which reasons that make it rational must be accessible to the trustor. Some say that these reasons must be available to this person in order for their trust to be rational; in that case, the person is or could be internally justified in trusting as they do. Others say that the reasons need not be internal but can instead be external to the trustor and lie in what caused the trust, or, more specifically, in the epistemic reliability of what caused it. The trustor also needn’t have access to or be aware of the reliability of these reasons. The latter’s epistemology of trust is externalist, while the former’s is internalist.