Leaving aside for the moment the influence of affective, rational, and collective logic, we will occupy ourselves solely with the considerable part played by the mystic elements which have prevailed in so many revolutions, and notably in the French Revolution. The chief characteristic of the mystic temperament consists in the attribution of a mysterious power to superior beings or forces, which are incarnated in the form of idols, fetiches, words, or formulae. The mystic spirit is at the bottom of all the religious and most political beliefs. These latter would often vanish could we deprive them of the mystic elements which are their chief support. Grafted on the sentiments and passionate impulses which it directs, mystic logic constitutes the might of the great popular movements. Men who would be by no means ready to allow themselves to be killed for the best of reasons will readily sacrifice their lives to a mystic ideal which has become an object of adoration. The principles of the Revolution speedily inspired a wave of mystic enthusiasm analogous to those provoked by the various religious beliefs which had preceded it. All they did was to change the orientation of a mental ancestry which the centuries had solidified. So there is nothing astonishing in the savage zeal of the men of the Convention. Their mystic mentality was the same as that of the Protestants at the time of the Reformation. The principal heroes of the Terror--Couthon, Saint-Just, Robespierre, &c.--were Apostles. Like Polyeuctes, destroying the altars of the false gods to propagate his faith, they dreamed of converting the globe. Their enthusiasm spilled itself over the earth. Persuaded that their magnificent formulae were sufficient to overturn thrones, they did not hesitate to declare war upon kings. And as a strong faith is always superior to a doubtful faith, they victoriously faced all Europe. The mystic spirit of the leaders of the Revolution was betrayed in the least details of their public life. Robespierre, convinced that he was supported by the Almighty, assured his hearers in a speech that the Supreme Being had ``decreed the Republic since the beginning of time.'' In his quality of High Pontiff of a State religion he made the Convention vote a decree declaring that ``the French People recognises the existence of the Supreme Being and the immortality of the soul.'' At the festival of this Supreme Being, seated on a kind of throne, he preached a lengthy sermon. The Jacobin Club, directed by Robespierre, finally assumed all the functions of a council. There Maximilien proclaimed ``the idea of a Great Being who watches over oppressed innocence and who punishes triumphant crime.'' All the heretics who criticised the Jacobin orthodoxy were excommunicated--that is, were sent to the Revolutionary Tribunal, which they left only for the scaffold.