Maulana Jalaluddin Rumi, one of the foremost Sufis, he was great poet of Persian, too. But Rumi had not composed even a single verse till reaching about half of his lifespan and was only known as a great religious scholar. But suddenly Rumi became one of the most impressive Sufi poets in the history. He became one of the most renowned Sufis as well, immersed in 'ishq-e-ilahi', or the great love of God. This metamorphosis is attributed to Shams Tabrizi, the great Sufi who moved from Damascus to Rumi's hometown Qonia. This article analyses the circumstances, reasons and events that culminated into such a great change in one of the most respected theologian of his times, turning him into a Sufi. Discussing the philosophy of these two great Sufis and quoting from their Persian writings the article draws some parallels between these two Sufis.