“If we leave aside the particulars and neglect the details, we can imagine the development of scientific views on the psychology of the blind in the form of a single line that goes from ancient times to the present day, then getting lost in the darkness of false ideas, then appearing again with each new conquest of science . Just as a magnetic needle points to the north, so this line points to the truth and allows us to evaluate any historical error by the degree of its deviation from this path by the angle of curvature of the main line...”