Thomas Nagel has provided a new view of certain areas of philosophical discussion, laying out the general structure of various philosophical problems. His unique contribution lies in his efforts to give new meaning to philosophy by reformulating traditional philosophical problems in a way that captures its core and shows that it is based on certain basic truths for human beings. While many others claim that philosophy has already come to an end, Nagel reminds us that we are only at the beginning. Although his solutions may not be definitive and final, he gives us a new and valid direction, in treating traditional philosophical problems in a way that can-do justice to their depth. Nagel's basic idea is to try to arrive at a unified global view of the world, but the subjective nature of conscious mental processes makes it difficult to see how such an aspiration can be implemented in relation to them. He explained that our attempts to combine the objective and subjective viewpoints tend to raise serious philosophical problems. When these two viewpoints conflict, they express an attempt to reduce each other. Nagel rejects such a reduction, asserting that our mental states cannot be reduced to neural processes, functional states, or behavioral actions, pointing out that the subjective character of experience is not understood by any of the reductive analyzes of mental phenomena.