Massage
One of the greatest Persian medics was Avicenna, also known as Ibn Sina, who lived from 980AD to 1037AD. His works included a comprehensive collection and systematisation of the fragmentary and unorganised Greco-Roman medical literature that had been translated Arabic by that time, augmented by notes from his own experiences. One of his books, "Al-Qānūn fī aṭ-Ṭibb" (The Canon of Medicine) has been called the most famous single book in the history of medicine in both East and West. Avicenna excelled in the logical assessment of conditions and comparison of symptoms and took special note of analgesics and their proper use as well as other methods of relieving pain, including massage.
Seddiqin argument
Avicenna detailed the argument for the existence of God in three books namely Al-ShifaThe Book of Healing and Al-Nejat and Al-isharat wa al-tanbihat. it seems that for the first time applied the argument of Seddiqin. According to Muhammad Legenhausen little pay attention to Avicenna's proof of sincere.Avicenna described the argument as seddiqin( Borhane seddiqin) because this argumentation applies by those who are truthful. According to Avicenna, those who are truthful persons, their argument is pure truth while there is no symbols of untruthfulness in their argumentation. In other words, Seddiqin witness to existence of God and truth just only by one argument which is the essence of Truth and God. Avicenna refers to the argument as follows:
Also Avicenna quotes the Quran to support the argumentation:" Is it not sufficient as regards your Lord that he is witness over all things"(surah 41, verse 53).