His family surname Litif is a derivation of the Qur'anic Sufis verses; virtually all the Sufis distinguish the Lataif-as-Sitta, otherwise referred to as the six subtleties; which are made of Nafs, Qalb, Sirr, Ruh, Khafi, and Akhfa.
Nefta is considered by most Sufis to be the spiritual home of Sufism, a mystical branch of Islam; many religious buildings are located in the district El Bayadha.
There he befriended a number of Sufis in the region including Khalilullah Khalili.
Bahr-ul-Uloom Muhammad Abdul Qadeer Siddiqi Qadri Hasrat's "Kulliyyat-e-Hasrat" (Collection of Poetry in devotion to the Prophet and other Sufis).
Tariqas were brought to China in the 17th century by Ma Laichi and other Chinese Sufis who had studied in Mecca and Yemen, and had also been influenced by spiritual descendants of the Kashgarian Sufi master Afaq Khoja.
Topper has also written about the Book of Revelation (Das letzte Buch, 1993), about Reincarnation believings from a historical and ethnological perspective (Wiedergeburt, 1988), Sufism in North Africa (Sufis und Heilige im Maghreb, 1984/1991) and similar subjects.