True salvation exhibits its light in this very world. Who is the one who attains salvation? Such a person is he who believes that God is true and that Muhammad, peace and blessings of Allah be upon him, is the Intercessor between God and all His creation, and that under the heaven there is no Messenger equal in rank to him, nor is there any book equal in status to the Quran. God did not desire that anyone should remain alive eternally, but this Chosen Prophet lives forever. To keep him alive forever, God has ordained that his spiritual and law-giving blessings would last until the day of resurrection. Finally, as a continuation of his spiritual blessings, God has sent unto the world the Promised Messiah—whose advent was essential for the completion of the edifice of Islam. It was necessary that the world should not come to an end until the dispensation of Muhammad had been granted a spiritual Messiah, as had been endowed to the Mosaic dispensation.
(Hazrat Mirza Ghulam Ahmadas, Noah’s Ark, pp. 24-25)