The Essence of Islam – Volume I — Page 222
222. Essence of Islam-1 way of determining this. No opponent, Christian or other, of a righteous Muslim who is a true follower of the Holy. Prophet [peace and blessings of Allāh be on him], can stand up and claim that he will exhibit the same type of signs which appear from heaven in support of the Muslim, or will display similar hidden mysteries as are displayed by him, or similar Divine help through acceptance of prayer, which might be manifested by him, or natural occurrences of the same type which might appear in his honour, or a prophecy of Divine favours or a prophecy warning an enemy of his of his dire end. None of them will come out to oppose a true follower of the. Holy Prophet [peace and blessings of Allāh be on him] in this manner, inasmuch as their hearts bear witness that they are liars and that they have no relationship with the. True God Who is the Helper of the righteous and Friend of the faithful. [Taşdīq-un-Nabi, pp. 45-46 or Maktūbāt-e-Ahmadiyya, Vol. 3, pp. 78,79)]. To believe in God's Messenger is a condition precedent to believing in the Unity of God. One cannot be separated from the other. A person who claims to believe in the Unity of God without following the Holy Prophet [peace and blessings of Allāh be on him], possesses only a dry bone which has no marrow and is holding a dark lamp which gives no light. Anyone who thinks that a person who believes in God as One without associate and does not believe in the Holy Prophet [peace and blessings of Allāh be on him] will yet achieve salvation, has a leprous heart and is blind and has no notion what Unity of. God means. Satan is better than him in his profession in the Unity of God, inasmuch as Satan, though he is disobedient, yet he believes that God is present, and such a person has no faith in God.