Significance of the Islamic Hijri Calendar

As an Islamic scholar wrote on the advent of the 15th century of the Hijrah calendar 22 years ago, “It (the advent of the 15th century) is indeed a unique occasion to ponder that the Islamic Era did not start with the victories of Islamic wars, nor with the birth or death of the Prophet nor even with the Revelation of the Qur’an itself. It starts with Hijrah, or the sacrifice for the cause of Truth and for the preservation of the Revelation.