Bilateral contrasts is a key term in Ferdinand de Saussure linguistics, constructuralism, deconstructuralism and Bakhtin school which plays a pivotal role in understanding the meaning and human thinking system. All these schools have a same approach in accepting contrasts as a pivotal forming factor in different human life systems; however, they have different interpretations in the kind of encountering of both sides of a contrast. Regardless of the consequences of interpreting bilateral contrasts in different philosophical, social, cultural and historical fields, what is important is the difference in attitude and reading of literary text every one of which result in a different interpretation. This article analyzes the concept of interpreting contrasts in constructuralism, deconstructuralism and Bakhtin school; then proves the contrast of interpretations by concentrating on contrast of light and darkness in Suhrawardi's works; The results show that the attitude of creator of the literary text and text reading, based on these theories, result in bilateral contrasts and result in reproducing different texts which get different voices based on mono-vocal or multi-attitudinal approach of author. It is the same as Sheikh e Ishraq works, contrasts as the end that constructuralism gives to contrasts, they have besting or unifying quality.