It was in ancient Greece that scientific thought emerged, especially from philosophy as a way of reflecting and placing oneself in the world. It was also during this period that the system of scientific evidence was developed, basing the practice and thus establishing the beginning of science in the western world. This means that rational thinking, explanations about life, have also been guided by reason. It did not mean the abandonment of beliefs in myths and the system of religiosity, but the coexistence of the world of belief in myths and gods and the world of reason.