Therefore, for each kind of thing as well as for each kind of conception and concept, there is its own mode of negation, such a negation in order to have development. In the calculation of infinitely small quantities, negation takes place differently from forming positive powers from negative roots. Must learn this, as well as everything else. Well-behaved woman rarely make history poster. If I only know that the barley stem and the calculation of the infinitely small quantities are covered in the concept of the negation of the negation, I still cannot be like a successful barley, nor can I do the differential and the calculus. Even if I only know the rules of the regulation of sound by the size of the strings, I still cannot play the violin right away.