Definition of cogito ergo sum
- I think, therefore I am
Usage examples of cogito ergo sum
When every sense impression seemed doubtful, cogito ergo sum left him with one certainty: the doubter himself had to exist.
She invoked cogito ergo sum after stripping away tradition, authority, and even perception as possible sources of error.
He used “cogito ergo sum” to explain why doubt itself can become evidence of one’s existence.