Beside the long and serious illness through which he passed, his spirit was destined to suffer a deeper wound by the death of Mrs. Allston, in London, during the same year. These events gave to his mind a more earnest and undivided interest in his spiritual relations, and drew him more closely than ever before to his religious duties. He received the rite of confirmation, and through life was a devout adherent to the Christian doctrine and discipline.
The character of Mr. Allston's religious feelings may be gathered, incidentally, from many of his writings. It is a subject to be treated with the reserve and delicacy with which he himself would have had it invested. Few minds have been more thoroughly imbued with belief in the reality of the unseen world; few have given more full assent to the truth, that "the things which are seen are temporal, the things which are not seen are eternal." This was not merely an adopted opinion, a conviction imposed upon his understanding; it was of the essence of his spiritual constitution, one of the conditions of his rational existence. To him, the Supreme Being was no vague, mystical source of light and truth, or an impersonation of goodness and truth themselves; nor, on the other hand, a cold rationalistic notion of an unapproachable executor of natural and moral laws. His spirit rested in the faith of a sympathetic God. His belief was in a Being as infinitely minute and sympathetic in his providences, as unlimited in his power and knowledge. Nor need it be said, that he was a firm believer in the central truths of Christianity, the Incarnation and Redemption; that he turned from unaided speculation to the inspired record and the visible Church; that he sought aid in the sacraments ordained for the strengthening of infirm humanity, and looked for the resurrection of the dead, and the life of the world to come.
After a second residence of seven years in Europe, he returned to America in 1818, and again made Boston his home. There, in a circle of warmly attached friends, surrounded by a sympathy and admiration which his elevation and purity, the entire harmony of his life and pursuits, could not fail to create, he devoted himself to his art, the labor of his love.