By competent evidence, is meant such as the nature of the thing to be proved requires; and by satisfactory evidence, is meant that amount of proof, which ordinarily satisfies an unprejudiced mind, beyond any reasonable doubt. The circumstances which will amount to this degree of proof can never be previously defined; the only legal test to which they can be subjected is, their sufficiency to satisfy the mind and conscience of a man of common prudence and discretion, and so to convince him, that he would venture to act upon that conviction in matters of the highest concern and importance to his own interest.(49) If, therefore, the subject is a problem in mathematics, its truth is to be shown by the certainty of demonstrative evidence. But if it is a question of fact in human affairs, nothing more than moral evidence can be required, for this is the best evidence which, from the nature of the case, is attainable. Now as the facts, stated in Scripture History, are not of the former kind, but are cognizable by the senses, they may be said to be proved when they are established by that kind and degree of evidence which, as we have just observed, would, in the affairs of human life, satisfy the mind and conscience of a common man. When we have this degree of evidence, it is unreasonable to require more. A juror would violate his oath, if he should refuse to acquit or condemn a person charged with an offence, where this measure of proof was adduced. § 28. Proceeding further, to inquire whether the facts related by the Four Evangelists are proved by competent and satisfactory evidence, we are led, first, to consider on which side lies the burden of establishing the credibility of the witnesses. On this point the municipal law furnishes a rule, which is of constant application in all trials by jury, and is indeed the dictate of that charity which thinketh no evil. _In the absence of circumstances which generate suspicion, every witness is to be presumed credible, until the contrary is shown; the burden of impeaching his credibility lying on the objector._(_50_)