This was said by Rene Descartes
It means I think therefore I am
For a yogi this is a laughable logic
The statement for a yogi is the exact opposite
Patanjali said it perfectly in Yoga Darshan
sattva purusha anyataa khyaatimaatrasya sarvabhaava adhishthaatrtvam sarvajnaatrtvam ca
This is verse 50 chapter 3
Intelligence is different from the self
It will be difficult for a non yogi to understand the greatness of the sentence
There are many more, even more subtle layers. These have been alluded to Agama shastra, Muktashastra and Shaiva shastra
Shree Chakra covers it all
Bhavin