Read and reflect on verse 419 from Surah Aal-i-Imraan: And God ordained this [to be said by His Apostle] only as a glad tiding for you, and that your hearts should thereby be set at rest - since no succour...
وَمَا جَعَلَهُ اللَّهُ إِلَّا بُشْرَىٰ لَكُمْ وَلِتَطْمَئِنَّ قُلُوبُكُمْ بِهِ ۗ وَمَا النَّصْرُ إِلَّا مِنْ عِنْدِ اللَّهِ الْعَزِيزِ الْحَكِيمِ
And God ordained this [to be said by His Apostle] only as a glad tiding for you, and that your hearts should thereby be set at rest - since no succour can come from any save God, the Almighty, the Truly Wise -