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Cogito Ergo Sum

Definition of Cogito Ergo Sum

It is a Latin phrase that when translated directly into Spanish means “I think, therefore I exist“. It is a statement of great popularity in the world of philosophy created by the French philosopher Rene Descartes.

Philosophically this Latin phrase denotes that the action of thinking is an irrefutable proof of existence. That is, it could be translated as “I think, therefore I exist”.


Cogito ergo sum comes directly from Latin, the word cogito means “to think”ergo, for its part, is “therefore and sum is” I am. Ultimately, the phrase translates as “I think, therefore I exist.”

The phrase was born in the book “Discourse on the method for conducting one’s own reason well and seeking the truth in science”. This book is the main work of the French philosopher René Descartes where he openly exposes his ideas on thought and reason.

As such, this phrase is one of the pillars of rationalism, whose creator and greatest exponent is Rene Descartes. Rationalism is a philosophical current that interposes reason as the main method of solving problems through thought.

This current of thought is based on the accuracy of mathematics, stating that something is only true when it is irrefutable.


The title of René Descartes’ book is often abbreviated only as ” Discourse on Method ” and has served as an inspiration for many philosophers over time.