cogito, ergo sum

Latin

Etymology

First written in French by René Descartes, a 17th century French philosopher, Discourse on the Method (1637) as je pense donc je suis, which he later expressed in Latin in Principles of Philosophy (1644).

Pronunciation

• (Classical) IPA^(key): /ˈkoː.ɡi.toː ˈer.ɡoː sum/, [ˈkoːɡɪt̪oː ˈɛrɡoː s̠ʊ̃ˑ]
• (modern Italianate Ecclesiastical) IPA^(key): /ˈko.d͡ʒi.to ˈer.ɡo sum/, [ˈkɔːd͡ʒit̪o ˈɛrɡo sum]

Phrase

cōgitō, ergō sum

1. I think therefore I am