Rene Descartes

Each problem that I solved became a rule, which served afterwards to solve other problems.

Each problem that I solved became a rule, which served afterwards to solve other problems.

Illusory joy is often worth more than genuine sorrow.

Illusory joy is often worth more than genuine sorrow.

Dubito ergo cogito; cogito ergo sum.(I doubt, therefore I think; I think therefore I am)

Dubito ergo cogito; cogito ergo sum.(I doubt, therefore I think; I think therefore I am)

I am accustomed to sleep and in my dreams to imagine the same things that lunatics imagine when awake.

I am accustomed to sleep and in my dreams to imagine the same things that lunatics imagine when awake.

I hope that posterity will judge me kindly, not only as to the things which I have explained, but also read more

I hope that posterity will judge me kindly, not only as to the things which I have explained, but also to those which I have intentionally omitted so as to leave to others the pleasure of discovery.