Surah al-Mujadilah (The Contention) 58 : 21

Explanatory Note 

This is indeed a true promise made by God: it came true in the past and will always come true, despite appearances that may suggest that it will not be so fulfilled. What actually happened was that the message of God's oneness overpowered unbelief and idolatry. The Islamic faith was well established on earth and humanity accepted its supremacy after a long struggle against unbelief, polytheism and atheism that ended in the total defeat of these evil forces. There were periods in which atheism or polytheism managed to gain power in certain areas, as happens today with some states that are openly atheist or polytheistic, yet belief in God generally remains dominant in the world. Besides, atheism and polytheism will always be short lived, because they are not fir to survive.

Humanity discovers every day new evidence guiding it to believe in God and to the consolidation of faith and belief in His oneness.

A believer treats a promise by God as a confirmed and undoubted fact. When we look today at the determined onslaught against the people of faith, in its numerous forms of suppression, pressure and scheming, we remember God's true promise. The onslaught has been so ferocious that large numbers of believers have been killed, tortured, left destitute and deprived of their livelihoods. Yet faith remained firm in believers' hearts, protecting them from yielding and protecting their communities from loss of identity and annihilation by attacking forces. It has also saved these communities from submitting to tyranny except for short periods during which they rallied their forces to defeat such oppression. When we look at this across the generations we realize that God's promise will undoubtedly come true. We find this now in the present situation without need to wait for long.

Anyhow, a believer will never entertain any doubt that God's promise is the truth and that this will certainly take place. Those who contend against God and His Messenger will be the most abject of people, for God and His messengers will triumph. A believer is absolutely certain that all this is inevitable, that it will be done, regardless of appearances to the contrary.