Cogito ergo sum – I think therefore I am

I think therefore I am

Descartes

Notes

• Cogito ergo sum is quoted from René Descartes’s Principles of Philosophy (1644).

• This phrase originally appeared in french as Je pense, donc je suis in Descartes’ discourse on Method (1637).

Vocabulary

• cogito: I think;
• ergo: therefore;
• sum: I am;

In other languages:

• Je pense, donc je suis (French);