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I think, therefore, I am
Famous philosopher Descartes theorized that a person can only be sure of his or her own existence. He was made famous through his quote, "I think, therefore I am." Philosophers use phrases where the beginning is proof of the final statement. I think, therefore I am basically means that I know I exist because I think and have awareness of my own mind. I can only be sure of my existence based on his theory. I think Billie is saying everyone needs to worry about themselves instead of everyone else.