One of the best books on Suluk and Tasawwuf by one of the later Naqshbandi Sufi Scholars, the great shaykh Faqir-Allah ibn Abd al-Rahman al-Naqshbandi Shikapuri, (d. 1195/1781, No. India), It discusses many aspects of traditional Sufism, addressing the virtue of piety and mentioning verses to say by day and night, and covering the virtues of the Qur'an and some of the Surahs and verses, and looking at the most beautiful names, the importance of hadith, and more.