ABSTRACT
Closed timelike curves or time machines are objects within General Relativity. Such objects bring a myriad of unsolved paradoxes. Convincing arguments against time machines and its paradoxes are missing today in physics and philosophy. In this article, a philosophical argument against time machines is given. According to the present argument, the belief in the Principle of Individuation or in a full process of individuation motivates the belief in time machines. Then, denying the process of individuationin some level, by using the Nietzsche-Heraclitus' perspective, one denies any type of human travel into the past.