Thanks to psychology we have the fact in relation to which all other facts are relative. Psychology is based on the structure of the rational soul, in which we can explore concepts such as motivation, personality, perception, etc. Consequently, epistemology, for its part, is the theory of knowledge. Epistemology leads us to question knowledge, what it is and how knowledge can be obtained, or how a person can acquire knowledge. In epistemology, we often associate knowledge with truth. We may often ask ourselves: How do we know that something represents the truth? According to Plato and his theory of knowledge, to know if something is true, we must not only believe the true proposition, but rather we must have a good reason to know what the truth is. In other words, believing that something has been proven true is not enough for something to acquire knowledge. I think that in epistemology, we must describe knowledge based on a system of justified truth. The third approach is metaphysics. The latter is a theory based on existence and reality. Metaphysics leads us to ask questions such as: how can we know that this thing or object exists? And, what is it? I think metaphysics is a relevant theory when talking about God or some kind of deity that we cannot see, hear or touch, but we hold that it exists. For example, metaphysics