What is the meaning of the quote, "i think, therefore i am"?

This phrase is an English translation of the Latin phrase “Cogito ergo sum.” It was first used by philosopher Rene Descartes. Descartes struggled with a problem that is now called “the problem of knowing,” and sometimes referred to as the “brain in a vat” dilemma. The idea is that the brain is easy to fool.

If you look at the surrounding words, you can get a general basis of what another word for inviolate would be. i would say that it is pristine