Significance of Double 'I' in Descartes Philosophy

Rene Descartes (1596-1650) is a popular name towards mathematical as well as philosophical truth. Descartes wants to redefine the philosophical truth with the help of same rational power that runs in mathematics. In the course of doing this, he first adopts the methodological doubt. He then applies the doubt method in all possible cases where he can doubt, and finally comes to the point that there at least one case remains indubitable which is - when he thinks (including doubts), he certainly exists. Thus, Descartes reaches a self-centred and self-critical discovery process of certainty in his philosophy; and immediate after he proposes the Latin proposition ‘Cogito Ergo Sum’ (in English ‘I think, therefore, I am or exist’). This paper now simply shows Descartes’ narrated clear and distinct idea to acquire true knowledge. It also focuses on the nature of the proposition which he has got indubitably, and further quests: is the conclusion ‘I am or exist’ deducing from the premise ‘I think’ or is it depended on the law of non-contradiction, etc.