The credibility, therefore, of a witness must diminish in proportion to the hatred, friendship, or close connection between himself and the accused. More than one witness is necessary, because, so long as one affirms and another denies, nothing is proved, and the right which everyone has of being held innocent prevails.[140] The credibility of a witness becomes appreciably less, the greater the atrocity of the crime imputed,[66] or the improbability of the circumstances, as in charges of magic and gratuitously cruel actions. It is more likely, as regards the former accusation, that many men should lie than that such an accusation should be true, because it is easier for many men to be united in an ignorant mistake or in persecuting hatred than for one man to exercise a power which God either has not conferred or has taken away from every created being. The same reasoning holds good also of the second accusation, for man is only cruel in proportion to his interest to be so, to his hatred or[141] to his fear. Properly speaking, there is no superfluous feeling in human nature, every feeling being always in strict accordance with the impressions made upon the senses. In the same way the credibility of a witness may sometimes be lessened by the fact of his being a member of some secret society, whose purposes and principles are either not well understood or differ from those of general acceptance; for such a man has not only his own passions but those of others besides.
1. When the proofs of a fact are dependent one on anotherthat is to say, when each single proof rests on[135] the weight of some otherthen the more numerous the proofs are, the smaller is the probability of the fact in question, because the chances of error in the preliminary proofs would increase the probability of error in the succeeding ones.Penalties of infamy ought neither to be too common, nor to fall upon too many persons at a time; not too common, because the real and too frequent effects of matters of opinion weaken the force of opinion itself; not too general, because the disgrace of many persons resolves itself into the disgrace of none of them.Count Pietro Verri was the son of Gabriel, who was distinguished alike for his legal knowledge and high position in Milan. At the house of Pietro, Beccaria and the other friends used to meet for the discussion and study of political and social questions. Alessandro, the younger brother of Pietro, held the office of Protector of Prisoners, an office which consisted in visiting the prisons, listening to the grievances of the inmates, and discovering, if possible, reasons for their defence or for mercy. The distressing sights he[10] was witness of in this capacity are said to have had the most marked effect upon him; and there is no doubt that this fact caused the attention of the friends to be so much directed to the state of the penal laws. It is believed to have been at the instigation of the two brothers that Beccaria undertook the work which was destined to make his name so famous.
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