"We find differences separating individual men greater, than the ever separated, closely allied animals, and hence also the evolution of qualities cannot be studied in men in the mass, but only in the continuing individual. The lack of power to make such a study leaves science unable to explain why some men tower above their fellows, intellectual and moral giants, unable to trace the intellectual evolution of a Shankarâchârya or a Pythagoras, the moral evolution of a Buddha or of a Christ."