Then we can come from the simplest idea. You can say that every thought has to be weighed. Like how Galileo wanted to measure the measurable and make the immeasurable. Descartes believed that philosophy should go from the simple to the complex. Swimming be strong be brave be humble be badass poster. Only then can a new understanding be built up. Finally, it is necessary to ensure that nothing is left out by continually listing and controlling. Then a philosophical conclusion will be within reach. Sounds like a math test. Yes, Descartes is a mathematician, he is considered the father of analytic geometry and he made an important contribution to algebra.