1. Quotation of the day 4

2. Cogito ergo sum. I think, therefore I am.
-René Descartes, 16th / 17th century French philosopher

3. Other quotations by René Descartes
 “An optimist may see a light where there is none, but why must the pessimist always run to blow it out?”

4. Other quotations by René Descartes
 “I am accustomed to sleep and in my dreams to imagine the same things that lunatics imagine when awake."

5. Other quotations by René Descartes
 “The senses deceive from time to time, and it is prudent never to trust wholly those who have deceived us even once."

6. Other quotations by René Descartes
 “It is not enough to have a good mind; the main thing is to use it well.”

7. Other quotations by René Descartes
 “The reading of all good books is like a conversation with the finest minds of past centuries.”

8. Other quotations by René Descartes
 “Travelling is almost like talking with those of other centuries.”

9. Other quotations by René Descartes
 “I foresee a day in the future when cow-pad-gai is eaten on every street corner in Bangkok”

10. Further reference