But while the poet avoids positive heresy, it is none the less true that much of his Díwán is not strictly religious in the Muḥammadan sense and may fairly be called 'philosophical.' This was enough to convict him of infidelity and atheism in the eyes of devout theologians who looked askance on moral teaching, however pure, that was not cast in the dogmatic mould. The pretended cause of his imprisonment by Hárún al-Rashíd--namely, that he refused to make any more love-songs--is probably, as Goldziher has suggested, a popular version of the fact that he persisted in writing religious poems which were supposed to have a dangerous bias in the direction of free-thought. His poetry breathes a spirit of profound melancholy and hopeless pessimism. Death and what comes after death, the frailty and misery of man, the vanity of worldly pleasures and the duty of renouncing them--these are the subjects on which he dwells with monotonous reiteration, exhorting his readers to live the ascetic life and fear God and lay up a store of good works against the Day of Reckoning. The simplicity, ease, and naturalness of his style are justly admired. Religious poetry, as he himself confesses, was not read at court or by scholars who demanded rare and obscure expressions, but only by pious folk, traditionists and divines, and especially by the vulgar, "who like best what they can understand."[542] Abu ’l-‘Atáhiya wrote for 'the man in the street.' Discarding conventional themes tricked out with threadbare artifices, he appealed to common feelings and matters of universal experience. He showed for the first and perhaps for the last time in the history of classical Arabic literature that it was possible to use perfectly plain and ordinary language without ceasing to be a poet. Although, as has been said, the bulk of Abu ’l-‘Atáhiya's poetry is philosophical in character, there remains much specifically Islamic doctrine, in particular as regards the Resurrection and the Future Life. This combination may be illustrated by the following ode, which is considered one of the best that have been written on the subject of religion, or, more accurately, of asceticism (_zuhd_):--