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.

The greatest minds are capable of the greatest vices as well as of the greatest virtues.

At last I will devote myself sincerely and without reservation to the general demolition of my opinions.

I am thinking, therefore I exist. (...) I was a substance whose whole essence or nature is solely to think, and which does not require any place, or depend on any material thing, in order to exist. Accordingly this 'I' - that is, the soul by which I am what I am - is entirely distinct from the body, and indeed is easier to know than the body, and would not fail to be whatever it is, even if the body did not exist.

There is a little gland in the brain in which the soul exercises its functions in a more particular way than in the other parts.

Situations in life often permit no delay; and when we cannot determine the course which is certainly best, we must follow the one which is probably the best. This frame of mind freed me also from the repentance and remorse commonly felt by those vacillating individuals who are always seeking as worthwhile things which they later judge to be bad.

Your joy is your sorrow unmasked. And the self-same well from which your laughter rises was often-times filled with your tears.