Metaphor is one of the most important fields of research in the meaning- based approach of Cognitive Linguistics. According to "Contemporary Theory of Metaphor", ordinary language and our conceptual system are fundamentally metaphorical and metaphor is the understanding of idea or conceptual domain. The main tenets of the Cognitive Theory of Metaphor are summarized in the form of eight hypotheses: Ubiquity Hypothesis, Domain Hypothesis, Model Hypothesis, Uni-directionality Hypothesis, Invariance Hypothesis, Necessity Hypothesis, Creativity Hypothesis, and Focusing Hypothesis. By metaphors, we can understand an abstract and unstructured conceptual domain. So, in religion, as a highly abstract domain, metaphors play an important role. In other words, in all researches done in this field, metaphor is the mostly studied one as a poetic and rhetorical device. The current research is concerned about applying the cognitive linguistic view of metaphor theory to the Nahj-al-Balagheh to analyze its metaphors and cognitive models. The empirical findings of this research prove the theoretical tenets and show that linguistic metaphors are abundant and constitute the ordinary ways of expressing central religious ideas in the texts investigated, due to the necessity of metaphorical conceptualization in abstract domains.