"Consider, my friend, the terrible controversy in which I am now engaged; what vast learning is required to go back to the remotest antiquity, to examine, weigh, confront prophecies, revelations, facts, all the monuments of faith set forth throughout the world, to assign their date, place, authorship, and occasion. What exactness of critical judgment is needed to distinguish genuine documents from forgeries, to compare objections with their answers, translations with their originals; to decide as to the impartiality of witnesses, their common-sense, their knowledge; to make sure that nothing has been omitted, nothing added, nothing transposed, altered, or falsified; to point out any remaining contradictions, to determine what weight should be given to the silence of our adversaries with regard to the charges brought against them; how far were they aware of those charges; did they think them sufficiently serious to require an answer; were books sufficiently well known for our books to reach them; have we been honest enough to allow their books to circulate among ourselves and to leave their strongest objections unaltered? "When the authenticity of all these documents is accepted, we must now pass to the evidence of their authors' mission; we must know the laws of chance, and probability, to decide which prophecy cannot be fulfilled without a miracle; we must know the spirit of the original languages, to distinguish between prophecy and figures of speech; we must know what facts are in accordance with nature and what facts are not, so that we may say how far a clever man may deceive the eyes of the simple and may even astonish the learned; we must discover what are the characteristics of a prodigy and how its authenticity may be established, not only so far as to gain credence, but so that doubt may be deserving of punishment; we must compare the evidence for true and false miracles, and find sure tests to distinguish between them; lastly we must say why God chose as a witness to his words means which themselves require so much evidence on their behalf, as if he were playing with human credulity, and avoiding of set purpose the true means of persuasion.