""History has not yet registered a stable appraisal for Giordano Bruno" writes Giorgio de Santillana in The Age of Adventure. Perceptions of Bruno were volatile enough in his lifetime; many have remained polarized to this day. Radoslav Tsanoff calls Bruno "the outstanding philosopher of the Renaissance," and Harold Hoffding cites Bruno's work as "the greatest philosophical thought-structure executed by the Renaissance." Yet Bertrand Russell despairs of crediting Bruno with philosophy at all: "There were fruitful intuitions lost in that disorder, but they had not yet reached the point of precision at which philosophy begins." The chasm of opinion dividing Bruno, even to this day, is one of the many improbables of this turbulent and exultant figure."