Who was René Descartes?

3. Why is Descartes Considered the Father of Modern Philosophy?

Descartes' doubt-seeking has a name. It's known as "methodological skepticism," and his realization of "I think, therefore I am" made clear to him that alone was the fundamental principle that anything that can be talked about or thought of can be true. Although this might seem like something of a stretch, that conclusion went on to inspire and divide philosophers and logicians alike. In other words, his reach was and is expansive.