The highest degree of faith is befriending for the sake of Allah...

The highest degree of faith is befriending for the sake of Allah, having enmity for the sake of Allah, spending on each other for the sake of Allah and establishing ties with each other for the sake of Allah, the Glorified. 52ـ غايَةُ الإيمانِ المُوالاةُ فيِ اللّهِ، والمُعاداةُ فيِ اللّهِ، والتَّباذُلُ فيِ اللّهِ، وَالتَّواصُلُ فيِ اللّهِ سُبْحانَهُ.

One type of faith is that which is firmly fixed in the hearts and another is that which shifts between the hearts and breasts [without being firmly fixed in the hearts]. 53ـ فَمِنَ الإيمانِ ما يَكُونُ ثابِتاً مُسْتَقِرّاً فِي القُلُوبِ ومِنْهُ ما يَكونُ عَوارِىَ بَينَ القُلُوبِ والصُّدُورِ. Allah, the Glorified, has prescribed faith as a purification from doubt. 54ـ فَرَضَ اللّهُ سُبْحانَهُ الإيمانَ تَطْهيراً