Divide each difficulty into as many parts as is feasible and necessary to resolve it.
I know that I exist; the question is, What is this 'I' that 'I' know.
Divide each difficulty at hand into as many pieces as possible and as could be required to better solve them.
Conquer yourself rather than the world.
The only secure knowledge is that I exist.
I have concluded the evident existence of God, and that my existence depends entirely on God in all the moments of my life, that I do not think that the human spirit may know anything with greater evidence and certitude.