It was now that the religious aspect of his character came to be emphasised. In common acts of life, public and private, the depths of his religious convictions very visibly appeared. And while it is impossible to understand his religious belief except through the knowledge of his life and writings on ordinary subjects, it is impossible on the other hand, to understand his life and writings without bearing in mind how vivid was his realisation of those truths of religion on which he most habitually dwelt. It was this which enabled him to undertake labours which, without such a power, must have crushed or enfeebled the spiritual growth which in him they seemed only to foster. His letters at this time show better than anything else how he was, though unconsciously to himself, maturing for the arduous duties he afterwards undertook. It was now, too, that he first became acquainted with Niebuhr's "History of Rome," which revolutionised his views of history, and, later, served as a model for his own "History of Rome." _II.--Headmaster of Rugby_ Arnold was not without his visions of ambition and extensive influence from the first, but he liked Laleham, and always looked back with fond regret to his time there. "I have always thought," he wrote in 1823, "with regard to ambition, that I should like to be _aut Caesar aut nullus;_ and as it is pretty well settled for me that I shall not be Caesar, I am quite content to live in peace as _nullus_." But the fates had ordered it otherwise. Friends had long been urging him to seek a larger sphere of usefulness; and when, in August, 1827, the headmastership of Rugby became vacant, he applied for the post. He had himself little hope of success. The testimonials he sent in were few, but all spoke strongly of his qualifications. Among them was a letter from Dr. Hawkins, the future Provost of Oriel, in which the prediction was made that if Arnold were elected he would change the face of education throughout the public schools of England. The impression produced upon the trustees by this letter and by the other testimonials was such that Arnold was immediately appointed. In June, 1828, he received priest's orders; in April and November of the same year took his degrees of B.D. and D.D., and in August entered on his new office. The post was in many respects suited to his natural tastes--to his love of tuition, which had now grown so strongly upon him that he declared sometimes that he could hardly live without such employment; to the vigour and spirits which fitted him rather to deal with the young than the old; to the desire of carrying out his favourite ideas of uniting things secular with things spiritual, and of introducing the highest principles of action into regions comparatively uncongenial to their reception. He had not, however, accepted it without grave doubts about his fitness. In a private letter he says: