“Likewise, victory and complete assistance (from Allaah) is only of the people of complete eemaan,
“Verily, We will indeed make victorious Our Messengers and those who believe (in the Oneness of Allah Islamic Monotheism) in this world’s life and on the Day when the witnesses will stand forth, (i.e. Day of Resurrection)” [Soorah Ghaafir (40):51]
And Allaah says,
“So We supported those who believed against their enemy and they become dominant.” [Soorah as-Saff (61):14]
So whoever is deficient in his eemaan, his portion of support and assistance (from Allaah) will also be deficient. Therefore, if a servant (of Allaah) is afflicted in his own self or in his wealth, or by his enemies being dominant over him, then all of this is due to his own sins or due to his abandoning of the obligations or due to his involvement in haraam. All of this is from his deficiency in eemaan.