The article focuses on miracles in Greek tragedy as an essential factor in pushing forward the frontiers of intellectual experience based on the notion of credibility rather than on the negative analysis of the term as an affirmation of truth conditions. Three questions are raised: a) How and when are certain events and phenomena perceived as miracles? b) Do miracles as phenomena beyond the cognitive grasp question the authenticity of human experience and knowledge? c) Does the miraculous contribute to the construction of an authorial identity? The study concentrates on Euripides’ tragedies which, in indicating a feeble human understanding and reception, recognize the limits of human’s cognitive reach; Euripides draws a clear line between the sophos, god or man, who can design a miracle-scene and thus form and reform religious consciousness and the receiver of the wonder-spectacle from whom the mechanisms that govern the miracle are hidden.