IBNA: German theologian and historian of religion, Heiler believes that prayer is the founding basis of all religions which causes the growth of good intimacy between human beings and lets them know each other better.

The book discusses various forms of prayer like religions prayer, primitive prayer, prayer in ancient Greek, perfection in prayer, philosophic thinking of prayer, prayer of great world figures, general features of mysticism and prophetic religions, prayer in mysticism, mystical prayer, prophetic prayer.

Arranged in 13 chapters, the book is converted into Persian by Shahabodin Abbasi. The Persian rendition of the book is organized in 544 pages and is published by Nashr Ney Publishing Company in Iran.