For his own part, the mystic is aware that his knowledge rests upon superphysical facts; which to him are just as tangible, for example, as those that form the foundation of the experiences and observations described by a traveller in Africa or any strange land. To the mystic applies what Annie Besant has said in her manual, "Death and After?" "A seasoned African explorer would care but little for the criticisms passed on his report by persons who had never been there; he might tell what he saw, describe the animals whose habits he had studied, sketch the country he had traversed, sum up its products and its characteristics. If he was contradicted, laughed at, set right, by untravelled critics, he would be neither ruffled nor distressed, but would merely leave them alone. Ignorance cannot convince knowledge by repeated asseveration of its nescience. The opinion of a hundred persons on a subject of which they are wholly ignorant is of no more weight than the opinion of one such person. Evidence is strengthened by many consenting witnesses, testifying each to his knowledge of a fact, but nothing multiplied a thousand times remains nothing." Here is expressed the mystic's view of his own situation. He hears the objections which are raised on every side, yet he knows that for himself he has no need to dispute them. He realizes that his certain knowledge is being criticized by those who have not had his experience, that he is in the position of a mathematician who has discovered a truth which can lose no value though a thousand voices are raised in opposition. Then again will arise the objection of the skeptics: "Mathematical truths may be proven to anyone," they will say, "and though perhaps you have really found something, we shall accept it only when we have learned of its truth through our own investigation." Such then have reason to consider themselves to be in the right, because it is clear to them that anyone who acquires the necessary knowledge can prove a mathematical truth, while the experiences professed by the mystic if true depend upon the special faculties of a few elect mystics, in whom they assume they are expected to blindly believe. For him, who rightly considers this objection, all justification for the doubt immediately vanishes; and mystics can here use the very logical reasoning of the skeptics themselves, by emphasizing the truth that the way to Higher Knowledge is open to anyone who will acquire for himself the faculties by which he may prove the spiritual truths herein claimed. The mystic asserts nothing which his opponents would not also be compelled to assert, if they did but fully comprehend their own statements. They, however, in making an assertion, often formulate a claim which constitutes a direct contradiction of that assertion.