SubstanceAs human beings, we have the abilities of thought and reasoning, which is why we evolved the way we did. However, we can never be sure that what we think and reason is actually the truth. And this idea can lead a person to ask themselves certain questions; What is the nature of existence? What is the nature of reality and its principles? but then other questions follow in these; What are we touching? What are we looking at? What are these things that interfere and modify our lives? Are they the same in reality as in our minds? What are these substances? Are they even substances? If they are real, why are they real and what are they? Many great philosophers have addressed these questions. Philosophers like Plato, Aristotle, Descartes, Spinoza and Berkeley. Everyone had an idea of ​​what the substance is. Plato's whole idea of ​​forms is what would be considered a substance. Form is the standard model or ideal model of the object or action that is named or mentioned. In order to understand the natural world and/or the material world, we must associate them with the substance we find in the intelligible world. Sensory perception is only concerned with the superficial appearance of a thing and is therefore of no value in understanding the world. These forms are necessary not only for understanding the material world, but also for understanding language itself. These forms of substance are a good way to explain what we understand about the natural, material world. Aristotle refuted Plato's idea of ​​forms. He believed that forms did not cause movement or change, nor did they help in understanding what is real and what is knowable. Aristotle presents the concept of substance in his work “The Categories”. He states that substance is the fusion of matter and form. Matter is that from which substance arises and form is that in which matter develops. When building a table, wood, nails, etc. constitute the material. The idea of ​​a table is the form, and the construction is the fusion, and the end result is the substance. René Descartes started by doubting everything. For Descartes, reason was both the foundation and guide to the search for truth. He wanted to bring some certainty into his life. So he started again. He rejected everything he had been taught. He rejected God, the Church, Aristotle, everyone else...... middle of paper ... as if our minds think predictions about what the mind creates. All have clear ideas about what substance is. The first two relate substance to ideas intelligible through the mind. The last three concern substance through God and perception. The philosopher I can come close to agreeing with is Aristotle. I can agree that substance is the creation of our own thoughts and works. I can't relate to the idea that God creates everything and is the reason for everything. I believe that things are the way they are for no reason. I don't see why there has to be one. I am what I am and that's it, but I enjoy the fact that my mind can expand to newer and brighter ideas, so maybe I can think differently with time and experience . (http://www.utm.edu/research/iep/d/descarte.htm)2.Ethics (1677) by Benedict de Spinoza Digitized and proofread by Edward A. Beach, Department of Philosophy and Religion, University of. Evansville (http://www.knuten.liu.se/~bjoch509/)3.Levenson, Carl; Jonathan Westphal. Reality. Indianapolis, Indiana Hackett Publishing Company, Inc.. 1994