 The epistemic basing relation is the relation which holds between a reason and a belief if and only if the reason is a reason for which the belief is held. It is generally thought to be a necessary, but not sufficient, condition for a belief’s being justified that the belief be based on a reason. The basing relation is what distinguishes good reasons which a person possesses that contribute to the personal justification of a given belief from good reasons which the person possesses but that do not contribute to the personal justification of the belief.