[7] During this period, he also studied nations sects and creeds and philosophical and theological issues, and with the ability to write at this age, he wrote books in these sciences in prose.

In the same period, he authored the book "Adaae al-Farz fi Sokoun al-Arz" (Arabic: اداء الفرض فی سکون الارض).

He pursued this knowledge and decided to write the book "Naqz al-Farz fi Isbaat Harakah al-Arz" (Arabic: نقض الفرض فی اثبات حرکه الارض).

After a while in 1906, he began to write the book "Al-Hey'ah va al-Islam" (Arabic: الهیئه و الاسلام) and introduced his new theories of astronomy according to Islamic sciences in it.

[9] It was a philosophical-political treatise that dealt with the harmonization of Islamic law with some aspects of Western civilization and culture, namely scientific discoveries, especially the science of the astronomy and new philosophies.

[10] He put the teaching of philosophy and abandoned intellectual knowledge in Islamic seminaries on the agenda and in his various lectures and writings, he called on students and the people to learn new sciences.

[10] In 1906 (1324 AH), during the Iranian constitutional movement, in addition to publishing articles and giving speeches in support of it, he participated in overt and covert meetings of constitutionalists.

[13] It is said that the corrective approach of this magazine was unprecedented in Najaf seminary until that time, and for this reason, there were written conflicts between him and Abd al-Husayn Sharaf al-Din al-Musawi.

[7] In 1914 (1332 AH), during the First World War, Shahrestani along with clerics such as Fethullah Qa'ravi Isfahani, Muhammad Kadhim Khorasani and Seyyed Mostafa Kashani, raised the flag of Imam Ali Shrine and went to the front to defend the country.

In 1920 (1338 AH) he joined the Iraqi revolution and under the leadership of Ayatollah Mirza Taqi al-Shirazi fought against the enemies of the country and the western colonizers.

In the midst of this battle, Mirza Taqi al-Shirazi passed away and Shahrestani was arrested and taken prisoner with another group and sentenced to death in a general court of war.

[13][25] Here are the chronology of his life and his most important activities:[26] Shahrestani's writings and works amount to over one hundred volumes of books and treatises in various Islamic sciences and fields in Arabic and Persian languages.

[31][34] Shahrestani died on the night of Monday, 7 February 1967 (Shawwal 26, 1386 AH)[35] at the age of 85 and was buried in the shrine of Musa al-Kadhim, Al-Kadhimiya Mosque, Kādhimayn, Baghdad, Iraq.