Boris Sidis,
A Study of Mental Epidemic
“ The most striking phenomenon in medieval history is that of the crusades, which agitated European nations for about two centuries, and cost them about seven million men. People were drawn by an irresistible longing toward the Holy Sepulcher, which fascinated their mental gaze, just as the butterfly is blindly dawn toward the candle. This attraction of devout Christians by the holy Sepulcher manifested itself in pilgrimages, which at first were rare, but gradually spread, and became a universal mania. ”
