An-Nazili emphasizes that the effectiveness of spiritual practice depends on proper pronunciation and presence of heart. He argues that every letter in a divine name holds a specific spiritual frequency.

Sayyid Muhammad Haqqi an-Nazili was a prominent Ottoman scholar, Sufi, and theologian. His background in both traditional Islamic sciences and Sufism allowed him to bridge the gap between outer ritual and inner spiritual power. In Khazinat al-Asrar , he synthesized centuries of knowledge regarding the spiritual efficacy of the Quran, drawing from the works of earlier masters like Imam al-Ghazali and Ahmad al-Buni.

Unlike traditional Tafsir (commentary) which focuses on legal and linguistic meanings, this work looks at the "hidden" or "unseen" influences of the text on the human soul and the physical world. Historical and Cultural Influence

While modern scientific perspectives may view these practices as purely psychological, for many believers, Khazinat al-Asrar offers a systematic approach to connecting with the Divine through the sacred language of the Quran. It remains a primary source for those seeking a deeper, more mystical engagement with Islamic scripture.

In Southeast Asia, particularly in Indonesia, the book is a staple in Pesantren (Islamic boarding schools), where students study it to understand the metaphysical dimensions of faith.

It explores the construction of mathematical squares and spiritual diagrams ( awfaq ) used for protection, seeking sustenance, or warding off evil.

Khazinat al-Asrar remains one of the most widely read books in the Islamic world concerning spiritual medicine. Its influence is particularly visible in: