... direction in which no natural march of events will ever proceed. In the first case my dream will not cause any harm; it may even support and augment the energy of the working people .... There is nothing in such dreams that would distort or paralyze labor-power. On the contrary, if a person were completely deprived of the ability to dream in this way, if they could not from time to time run ahead and mentally conceive, in an entire and completed picture, the product to which their hands are only just beginning to lend shape, then I cannot at all imagine what stimulus there would be to induce people to undertake and complete extensive and strenuous work in the sphere of art, science, and practical endeavor .... Dimitry Pisarev (1864)

According to this quote, what does "natural march" mean?