Why must progress always present a dark and light side?

Progress must always present a dark and light side to those who live almost entirely in the gloom of a slow, inert vibration.

Your work is to try to enlighten the vibrations of the earth plane so that these oppositions are not allowed to continue to act in negative ways.

There can be no comparison between the ignorant mind, which was ready to fight for his belief that his world was square, and the partially-freed mind, which knows not only that the earth is a ball of matter that is forever circling, but also that it is merely a conglomeration of atoms held together by a fixed vibratory rate.