If I go for the alternative which is false, then obviously I shall be in error; if I take the other side, then it is by... chance that I arrive at the truth, and I shall still be at fault.... In this incorrect use of free will may be found the privation which constitutes the essence of error.

By 'God', I understand, a substance which is infinite, independent, supremely intelligent, supremely powerful, and which created both myself and everything else [...] that exists. All these attributes are such that, the more carefully I concentrate on them, the less possible it seems that they could have originated from me alone. So, from what has been said it must be concluded that God necessarily exists.

Common sense is the most widely shared commodity in the world, for every man is convinced that he is well supplied with it.

I desire to live in peace and to continue the life I have begun under the motto 'to live well you must live unseen

Few look for truth; many prowl about for a reputation of profundity by arrogantly challenging whichever arguments are the best.

Here I beg you to observe in passing that the scruples that prevented ancient writers from using arithmetical terms in geometry, and which can only be a consequence of their inability to perceive clearly the relation between these two subjects, introduced much obscurity and confusion into their explanations.

For each of us there is a set limit to our intellectual powers which we cannot pass.