ABSTRACT Objective: In the bulk of literature on critical thinking, the influence of interest on cognitive and affective processes of individuals has always been a source of debate and disagreement; a reciprocal relationship to be detrimental or facilitative in the development and enhancement of critical thinking as a skill. The present paper aims at explaining and resolving the observed discrepancy, with the combination of a comparative (agreement method) and a (descriptive-analytical). Method: method, on the additive and regressive effect of “interest” (...) on critical thinking-product from the viewpoint of Islamic Traditions. Finding: The finding shows that although interest, as a human tendency, generally has a positive effect on critical thinking, in some cases, the same component prevents seeing the shortcomings and defects as well. Therefore, in critical thinking, which requires more judgment and evaluation in order to promote it, one must control the interest in the subject in order to form a critical view of the issue properly. Based on the results, it is suggested that more attention should be paid to the regressive role of interest in critical thinking, especially in the cognitive and metacognitive understanding of the mental structure of thinking. Accordingly, an updated and systematic rereading of religious doctrines is one of the necessities of the conscious life in the third millennium, especially when the effective and productive approach to psychological components is more and more needed for today's life. Conclusion: Also, it is strongly suggested that the insights driven by Islamic traditions especially those that tap upon the issues on psychology are diverse and rich, providing a cultivated and rich ground for an understanding of human cognition and mind. (shrink)