It is not enough to have a good mind. The main thing is to use it well.
A state is better governed which has few laws, and those laws strictly observed.
In order to improve the mind, we ought less to learn, than to contemplate.
It is possible that I am dreaming right now and that all of my perceptions are false.
In God there is an infinitude of things which I cannot comprehend, nor possibly even reach in any way by thought; for it is the nature of the infinite that my nature, which is finite and limited, should not comprehend it.
I am indeed amazed when I consider how weak my mind is and how prone to error.