(65) Examining this question by the aid of natural reason, I will proceed as follows. (66) If anyone wishes to persuade his fellows for or against anything which is not self-evident, he must deduce his contention from their admissions, and convince them either by experience or by ratiocination; either by appealing to facts of natural experience, or to self-evident intellectual axioms. (67) Now unless the experience be of such a kind as to be clearly and distinctly understood, though it may convince a man, it will not have the same effect on his mind and disperse the clouds of his doubt so completely as when the doctrine taught is deduced entirely from intellectual axioms - that is, by the mere power of the understanding and logical order, and this is especially the case in spiritual matters which have nothing to do with the senses. (68) But the deduction of conclusions from general truths a priori, usually requires a long chain of arguments, and, moreover, very great caution, acuteness, and self-restraint - qualities which are not often met with; therefore people prefer to be taught by experience rather than deduce their conclusion from a few axioms, and set them out in logical order. (69) Whence it follows, that if anyone wishes to teach a doctrine to a whole nation (not to speak of the whole human race), and to be understood by all men in every particular, he will seek to support his teaching with experience, and will endeavour to suit his reasonings and the definitions of his doctrines as far as possible to the understanding of the common people, who form the majority of mankind, and he will not set them forth in logical sequence nor adduce the definitions which serve to establish them. (70) Otherwise he writes only for the learned - that is, he will be understood by only a small proportion of the human race.