Lecture One
By interweaving subjects in this way you will not only give humanity something that is culturally interesting; you will also meet an educational need by bringing together the so-called physical, which does not as such exist, and the abstract spiritual, which again has no meaning as such. Thus you may enter the classroom in such a way that your words carry weight and, at the same time, acquire wings. You will not torture the children with words that merely fly away, nor will you teach them skills and aptitudes that weigh them down.
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