Here was certainly a full and varied life, responsive to many personal moods and many tides of public feeling. Lowell drew intellectual stimulus from enormously wide reading in classical and modern literatures. Puritanically earnest by inheritance, he seems also to have inherited a strain of levity which he could not always control, and, through his mother's family, a dash of mysticism sometimes resembling second sight. His physical and mental powers were not always in the happiest mutual adjustment: he became easily the prey of moods and fancies, and knew the alternations from wild gaiety of spirits to black despair. The firm moral consistency of Puritanism was always his, yet his playful remark about belonging in a hospital for incurable children had a measure of truth in it also. Both his poetry and his prose reveal a nature never quite integrated into wholeness of structure, into harmony with itself. His writing, at its best, is noble and delightful, full of human charm, but it is difficult for him to master a certain waywardness and to sustain any note steadily. This temperamental flaw does not affect the winsomeness of his letters, unless to add to it. It is lost to view, often, in the sincerity and pathos of his lyrics, but it is felt in most of his longer efforts in prose, and accounts for a certain dissatisfaction which many grateful and loyal readers nevertheless feel in his criticism. Lowell was more richly endowed by nature and by breadth of reading than Matthew Arnold, for instance, but in the actual performance of the critical function he was surpassed in method by Arnold and perhaps in inerrant perception, in a limited field, by Poe.