Nothing comes out of nothing.

Everything is self-evident.

Neither divine grace nor natural knowledge ever diminishes freedom.

My third maxim was to try always to conquer myself rather than fortune, and to change my desires rather than the order of the world, and generally to accustom myself to believing that there is nothing entirely in our power except our thoughts, so that after we have done our best regarding things external to us, everything in which we do not succeed is for us absolutely impossible.

He lives well who is well hidden.

I experienced in myself a certain capacity for judging which I have doubtless received from God, like all the other things that I possess; and as He could not desire to deceive me, it is clear that He has not given me a faculty that will lead me to err if I use it aright.

The chief cause of human errors is to be found in the prejudices picked up in childhood.