Lincoln, Rumi, Shams and Rabi'a in one volume? How is that possible? While three are Sufis, even Rumi and Shams are separated by a gulf of 400 years from Rabi'a. As for Rabi'a, she was at different times in her life, an orphan, a slave and a prostitute. And Lincoln? On top of another 500 years, the great statesman belongs to an entirely different civilization and religion. Where's the connection? "To the spiritual seeker,", Kehl and Walker contend,"The...