The revival of the Renaissance in the West began when people began to think very critically about the situation, everything was faced with the "judicial" ratio. To reach a truth requires various ways of thinking and proving, one of which is through the benchmark of Rationalism which had a big influence on the foundation of enlightenment at the beginning of the century. It is important to re-examine rationalism in the postmodern era like now, whether the only valid truth is only rational truth that makes sense, whether only reason is the only source of truth, or are there other truths that cannot be reached by rationalism. The purpose of this writing is to know and understand epistemological rationalism as a theory of truth. This research method uses literature (library study) by collecting and exploring data or library materials related to the discussion themes and problems. The results of the research show that: 1) Rationalism is a philosophical view that firmly adheres to the fact that reason is the most important tool for obtaining knowledge, the highest truth lies in human reason or reason. 2) Descartes created a method of doubt in his philosophy called the method of doubt, questioning all beliefs, ideas, thoughts and material obtained through the senses. The information and knowledge received by humans from birth is not guaranteed to be true, therefore everything must be tested again by underestimating it. 3) Even though it is guided by rational and empirical principles, in reality rationalism is unable to explain or reach empirical existence outside the mind such as color, taste, smell or image.
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