116. We have thus alighted on the portion of his life most signalized by literary work. Overpowering as is the impression of the remarkableness of this man produced by following him, as we have been doing, as he hurries from province to province, from continent to continent, over land and sea, in pursuit of the object to which he was devoted, this impression is immensely deepened when we remember that he was at the same time the greatest thinker of his age, if not of any age, and, in the midst of his outward labors, was producing writings which have ever since been among the mightiest intellectual forces of the world, and are still growing in their influence. In this respect he rises sheer above all other evangelists and missionaries. Some of them may have approached him in certain respects--Xavier or Livingstone in the world-conquering instinct, St. Bernard or Whitefield in earnestness and activity. But few of these men added a single new idea to the world's stock of beliefs, whereas Paul, while at least equaling them in their own special line, gave to mankind a new world of thought. If his Epistles could perish, the loss to literature would be the greatest possible with only one exception--that of the Gospels which record the life, the sayings and the death of our Lord. They have quickened the mind of the Church as no other writings have done, and scattered in the soil of the world hundreds of seeds the fruits of which are now the general possession of mankind. Out of them have been brought the watchwords of progress in every reformation which the Church has experienced. When Luther awoke Europe from the slumber of centuries, it was a word of Paul which he uttered with his mighty voice: and when, one hundred years ago, our own country was revived from almost universal spiritual death, she was called by the voices of men who had rediscovered the truth for themselves in the pages of Paul. 117. Form of his Writings.--Yet in penning his Epistles Paul may himself have had little idea of the part they were to play in the future. They were drawn out of him simply by the exigencies of his work. In the truest sense of the word they were letters, written to meet particular occasions, not formal writings, carefully designed and executed with a view to fame or to futurity. Letters of the right kind are, before everything else, products of the heart; and it was the eager heart of Paul, yearning for the weal of his spiritual children or alarmed by the dangers to which they were exposed, that produced all his writings. They were part of his day's work. Just as he flew over sea and land to revisit his converts, or sent Timothy or Titus to carry them his counsels and bring news of how they fared, so, when these means were not available, he would send a letter with the same design.