How can you measure a feeling?
Physicists, mechanic, mathematician, and metaphysical philosopher Reńe Descartes (1596-1650), lived in a period of great changes.
Descartes wanted to have a reliable bases for the foundation of science. That is why he wanted to engage in metaphysics. His foundation for science was found on God. He lived in a period and a place where doubt, regarding God, authority, and the church was strong. We are taking about the French Enlightenment.
He reaches his thesis for God as the foundation in a strange way. His method was to use doubt. He was not a skeptic but he decided to construct a method of doubt. Doubt everything, even the five senses. That is the method.
Having reached the extreme of doubting, Descartes realizes that in his ‘Discourse on the method’ that “I am thinking, therefore I exists”, even doubting everything’s existence leads him to this reality, that thinking is evidence for existence.
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