Kufr (disbelief in Lord, Prophets, Messengers, Books of Allah, Life after death, Destiny) and sins are the cause of all afflictions and evil in this world and the Hereafter, while tawhid (belief in the Oneness of Allah) and Iman (belief) in Him and His Messengers, obedience to Him and His Messengers, holding fast to His Shari‘ah (Islamic law), Da‘wah (calling) people to it, and refuting those who oppose it, are the causes of all good in this world and in the Hereafter. Perseverance on these principles and enjoining and cooperating in them bring honor in this world and the Hereafter, and salvation from every evil and protection from every Fitnah (trial).
Allah (may He be Praised) says: “O you who believe! If you help (in the cause of) Allâh, He will help you, and make your foothold firm. And He (may He be Praised) says: Verily, Allâh will help those who help His (Cause). Truly, Allâh is All Strong, All Mighty“.
Allâh has promised those among you who believe and do righteous good deeds, that He will certainly grant them succession to (the present rulers) in the land, as He granted it to those before them, and that He will grant them the authority to practise their religion which He has chosen for them (i.e. Islâm). And He will surely give them in exchange a safe security after their fear (provided) they (believers) worship Me and do not associate anything (in worship) with Me. But whoever disbelieves after this, they are the Fâsiqûn (rebellious, disobedient to Allâh).
And: And if the people of the towns had believed and had the Taqwâ (piety), certainly, We should have opened for them blessings from the heaven and the earth, but they belied (the Messengers). So We took them (with punishment) for what they used to earn
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