Cogito ergo sum
外觀
![](http://upload.wikimedia.org/wikipedia/commons/thumb/b/b4/Ren%C3%A9_Descartes.jpg/225px-Ren%C3%A9_Descartes.jpg)
Cogito ergo sum sī chi̍t kù La-teng-gú, iû Hoat-kok ê tiat-ha̍k-ka René Descartes só͘ thê-chhut ê chi̍t ê tiat-ha̍k bēng-tê; tī Tiong-bûn pī hoan-e̍k chò ngó͘ su kò͘ ngó͘ chāi (我思故我在), ì-sù sī goá su-khó só͘-í goá chûn-chāi. Descartes pún-lâng jīn-ûi che sī chi̍t ê choa̍t-tùi khó-khò ê chin-lí kap tē-it goân-lí.