7th. That readers adverting to the circumstance that they never discovered any falsity in things which they clearly conceived, and that, on the contrary, they never found, unless by chance, any truth in things which they conceived but obscurely, consider it to be wholly irrational, if, on account only of certain prejudices of the senses, or hypotheses which contain what is unknown, they call in doubt what is clearly and distinctly conceived by the pure understanding; for they will thus readily admit the following axioms to be true and indubitable, though I confess that several of them might have been much better unfolded, and ought rather to have been proposed as theorems than as axioms, if I had desired to be more exact.

Axioms or Common Notions

I . Nothing exists of which it cannot be inquired what is the cause of its existing; for this can even be asked respecting God; not that there is need of any cause in order to his existence, but because the very immensity of his nature is the cause or reason why there is no need of any cause of his existence.