Kaleed al Tauheed کلید التوحید written by Hazrat Sultan Bahoo Rahmatullah alaeh. A great writer, a great book, on topic of Islamic sufism, real Islam, spirit of Islam, Faqr, Ishq, Love, Allah, Baa Hoo, Walayat, Wali, Muslim, Tasawwaf, Tauheed, Momin and lot more other sensitive topics. One who has the quest for self awareness or God's awareness, must read.