The paper aims to show how, in the Myth of Er, Plato explores the conditions from which souls before incarnation, decide how they will live their next life. The emphasis is strongly influenced Plato gives the past when making a new decision; and this implies that life can become a repeat of the past blind, unaware of it. Furthermore, with the criticism of repetition, the philosopher denounces the decisions made from the habit without requiring reflection philosophy. So hold Socrates either case, the decisions leading to the error can avoided only through philosophy.