The two operations of our understanding, intuition and deduction, on which alone we have said we must rely in the acquisition of knowledge. – Rene Descartes
Except our own thoughts, there is nothing absolutely in our power. – Rene Descartes
Divide each difficulty into as many parts as is feasible and necessary to resolve it. – Rene Descartes
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. – Rene Descartes