of the mind. Until science can teach us to reproduce such phenomena at will, science cannot claim to have explained them; and they can be judged only by their fruits.
From that time until his death, Pascal was closely associated with the society of Port-Royal which his sister Jacqueline, who predeceased him, had joined as a religieuse; the society was then fighting for its life against the Jesuits. Five propositions, judged by a committee of cardinals and theologians at Rome to be heretical, were found to be put forward in the work of Jansenius; and the society of Port-Royal, the representative of Jansenism among devotional communities, suffered a blow from which it never revived. It is not the place here to review the bitter controversy and conflict; the best account, from the point of view of a critic of genius who took no side, who was neither Jansenist nor Jesuit, Christian nor infidel, is that in the great book of Sainte-Beuve, Port-Royal. And in this book the parts devoted to Pascal himself are among the most brilliant pages of criticism that Sainte-Beuve ever wrote. It is sufficient to notice that the next occupation of Pascal, after his conversion, was to write these eighteen "Letters," which as prose are of capital importance in the foundation of French classical style, and which as polemic are surpassed by none, not by Demosthenes, or Cicero, or Swift. They have the limitation of all polemic and forensic: they persuade, they seduce, they are unfair. But it is also unfair to assert that, in these Letters to a Provincial, Pascal was attacking the Society of Jesus in itself. He was attacking rather a particular school of casuistry which relaxed the requirements of the Confessional; a school which certainly flourished amongst the Society of Jesus at that time, and of which the Spaniards Escobar and Molina are the most eminent authorities. He undoubtedly abused the art of quotation, as a polemical writer can hardly help but do; but there were abuses for him to abuse; and he did the job thoroughly. His Letters must not be called theology. Academic theology was not a department in which Pascal was versed; when necessary, the fathers of Port-Royal came to his aid. The Letters are the work of one of the finest mathematical minds of any time, and of a man of the world who addressed, not theologians, but the world in general--all of the cultivated and many of the less cultivated of the French laity; and with this public they made an astonishing success.
During this time Pascal never wholly abandoned his scientific interests. Though in his religious writings he composed slowly and painfully, and revised often, in matters of mathematics his mind seemed to move with consummate natural ease and grace. Discoveries and inventions sprang from his brain without effort; among the minor devices of this later period, the first omnibus service in Paris is said to owe its origin to his inventiveness. But rapidly failing health, and absorption in the great work he had in mind, left him little time and energy during the last two years of his life.