In 1811 he was elected a scholar at Corpus Christi College, Oxford, and four years later became a Fellow at Oriel College. He gained in 1815 and in 1817 the Chancellor's prize for the two University essays, Latin and English. In college he had a passion for Aristotle and Thucydides. Next to these he loved Herodotus. Though delicate in appearance, he took long walks, in which he studied nature, being a lover of flowers, birds, and clouds. His friendships were warm and lasting. John Keble, author of "The Christian Year," Whately, later Archbishop of Dublin, and Coleridge, afterwards chief-justice, were his especial friends. During his four years as a Fellow in Oriel College, he took private pupils, and read in the Oxford libraries. His plan was to make himself master of some one period, like the fifteenth century, and write full notes upon it. Oxford was always very dear to Arnold. He wrote years later, "If I live till I am eighty, and were to enjoy all the happiness that the warmest wish could desire, I should never forget or cease to look back with something of a painful feeling on the years we were together there, and on all the delights that we have lost." During these college years he was often restless and weary of duty, inclined to indolence, and an early riser with the greatest difficulty. These things he overcame in later life. He had some religious doubts, which completely vanished as he studied and thought more deeply. In 1819 Arnold removed to Laleham, with his mother, sister, and aunt, and remained here for the next nine years, preparing private pupils for the universities. A year after coming to Laleham, he married, when he was twenty-five, Mary, youngest daughter of the Rev. John Penrose, in Nottinghamshire, and sister of one of his best college friends, Trevenen Penrose. She was a worthy helper through all the laborious years which followed. Although Arnold had fitted himself for the Church, he loved the work of teaching. He wrote to a friend about to engage in a similar occupation. "I know it has a bad name, but my wife and I always happened to be fond of it.... I enjoyed and do enjoy the society of youths of seventeen or eighteen; for they are all alive in limbs and spirits at least, if not in mind, while in older persons the body and spirits oftener become lazy and languid without the mind gaining any vigor to compensate for it.... "The misery of private tuition seems to me to consist in this, that men enter upon it as a means to some further end; are always impatient for the time when they may lay it aside; whereas, if you enter upon it heartily as your life's business, as a man enters upon any other profession, you are not then in danger of grudging every hour you give to it....