… moral certainty is certainty which is sufficient to regulate our behaviour, or which measures up to the certainty we have on matters relating to the conduct of life which we never normally doubt, though we know that it is possible, absolutely speaking, that they may be false.
Rene Descartes
Doubt
I am thing that
I am thing that thinks: that is, a things that doubts,affirms, denies, understands a few things, is ignorant of many things, is willing, is unwilling, and also which imagines and has sensory perceptions.
Rene Descartes
I did not imitate
I did not imitate the skeptics who doubt only for doubting’s sake, and pretend to be always undecided; on the contrary, my whole intention was to arrive at a certainty, and to dig away the drift and the sand until I reached the rock or the clay beneath.
Rene Descartes
The first precept was
The first precept was never to accept a thing as true until I knew it as such without a single doubt.
Rene Descartes
For I found myself
For I found myself embarrassed with so many doubts and errors that it seemed to me that the effort to instruct myself had no effect other than th eincreasing discovery of my own ignorance
Rene Descartes
I can doubt everything,
I can doubt everything, except one thing, and that is the very fact that I doubt. Simply put – I think, therefore I am
Rene Descartes
Doubt is the origin
Doubt is the origin of wisdom
Rene Descartes
When I had satisfied
When I had satisfied myself that no star of that kind had ever shone before, I was led into such perplexity by the unbelievability of the thing that I began to doubt the faith of my own eyes.
Tycho Brahe