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in the most certain and human way I wish to make it manifest. Therefore, give yourselves to such diligence and earnestness in hearing and listening as I will bring you a mastery of the teaching: namely, of the things that I have seen with my own eyes, and touched with my own hands. Of this, I will provide you with more direct, certain, and trustworthy knowledge than the deceitful narrators and swindlers who, after much expense and great labor, accomplish nothing but that they end up in toil. Therefore, I will speak clearly and openly with you, so that the experienced and the inexperienced may understand from this mastery. No one should rightly be able to slander me or speak against me, for the ancient philosophers wrote of it so darkly and confusedly that they were not only not understood, but...