When language became more complex, it closed as it were one wing, the sense of tone - keeping the other wing, the sense of rhythm, outspread. This made poetry a subject distinct and separate from music. In ancient times religions, philosophies, sciences and arts were expressed in poetry. Parts of the Vedas, Puranas, Ramayana, Mahabharata, Zendavesta, Kabala and Bible are to be found in verse, as well as different arts and sciences in the ancient languages. Among the scriptures the only work in prose is the Qur'an, and even this is not devoid of poetry. In the East, even in recent times, not only manuscripts of science, art and literature were written in poetry, but the learned even discoursed in verse.