URL：https://4.bp.blogspot.com/-9ot6RL60-iM/Wi-kVYOiNEI/AAAAAAAAUNQ/L_iNfgUSzKMTeyStNBGk5kMUsYPcfpRNgCKgBGAs/w1200-h630-p-k-no-nu/Frans_Hals_-_Portret_van_Ren%C3%A9_Descartes.jpg
掲載元：https://www.nagahitoyuki.com/2017/12/what-rene-descartes-said-i-think-therefore-i-am-is-the-first-principle-of-philosophy-to-grasp-reality-itself.html
