(And, verily, Our Word has gone forth of old for Our servants, the Messengers,) meaning, it has already been stated in the first decree that the Messengers and their followers will ultimately prevail in this world and the Hereafter. This is like the Ayah:
In verses 171-173, it was said: وَلَقَدْ سَبَقَتْ كَلِمَتُنَا لِعِبَادِنَا الْمُرْسَلِينَ إِنَّهُمْ لَهُمُ الْمَنصُورُونَ وَإِنَّ جُندَنَا لَهُمُ الْغَالِبُونَ (And Our Word has already gone ahead in favor of Our servants - the messengers - they are the ones who will have Allah's support, and verily it will be Our army that prevails). The sense of these verses is that it stands predetermined with Allah that His chosen servants, that is, the prophets would be the ones to prevail. This may raise a difficulty, for in the mortal world, some prophets did not. For an answer to this, it could be said that the majority of prophets consists of the noble souls whose people belied them and met their punishment while they were kept safe from it. There are only a few among the blessed prophets who, though, could not prevail outwardly and physically right up to the end of their tenure in this world, but they always enjoyed ascendancy in the field of logic and argument, and the ultimate intellectual victory remained always theirs. However, the physical traces of this ascendancy were - due to some consideration of wisdom, such as a trial, or its likes - deferred until the Hereafter. Hence, as said by sage Thanavi, it is like the case of a highway robber, who starts harassing a high appointee of the state while on his journey. But, this appointee would never, by virtue of his God-given intellectual sobriety, stoop to the low-down robber, until he reaches the capital of his state where the robber will be seized and punished. Therefore, simply due to this temporary ascendancy, neither can we call that robber an authority, nor that authority a subject. In fact, given the true state of affairs, that robber - despite this temporary ascendancy - is still a subject, while that man of authority - despite his temporary lack of ascendancy - is still the authority he had been all along. Sayyidna Ibn ` Abbas رضی اللہ تعالیٰ عنہما has expressed this more briefly and lucidly by saying: اَن لَّم یُنصَروا فِی الدُّنِیَا یُنصرُا فِی الاٰخرِۃِ (Those who' are not helped to ascend in the present world are helped to ascend in the Hereafter) - Bayan-ul- Qur’ an, the Tafsir of Surah al-Ma'idah (5).
A belief has it, that the ‘jinn’ are both the opponents and equals of God. But those who hold this belief are greatly misguided. They also think that the forces of evil are in the hands of the jinn and forces of righteousness are in the hands of the angels; both having the power to create trouble or bring success to anybody they like. Similarly, the Zoroastrians believe in the duality of the godhead. According to them, Yazdan is the god of righteousness and Aherman is the god of evil. Man, on the basis of his false assumptions, worships angels when angels themselves proclaim the greatness of the one and only God, at all times.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.