This confusion stems from the fact that, early in Persian literary history, the poetic vocabulary was usurped by mystics, who believed that the ineffable could be better approached in poetry than in prose. In composing poems of mystic content, they imbued every word and image with mystical undertones, causing mysticism and lyricism to converge into a single tradition. As a result, no fourteenth-century Persian poet could write a lyrical poem without having a flavor of mysticism forced on it by the poetic vocabulary itself. While some poets, such as Ubayd Zakani, attempted to distance themselves from this fused mystical-lyrical tradition by writing satires, Hafez embraced the fusion and thrived on it. Wheeler Thackston has said of this that Hafez "sang a rare blend of human and mystic love so balanced... that it is impossible to separate one from the other".