He who loves for the sake of Allah is beloved of Allah, and he who is loved for the sake of Allah is also beloved of Allah, since each loves the other for the sake of Allah. The Messenger of Allah said, 'Man is with whom he loves. Whoever loves a bondsman in Allah, loves Allah. No one loves Allah except he whom Allah loves.' And again, 'The best of people after the prophets in this world and the next are those who love each other for Allah.' Every love based on some cause other than Allah brings about enmity except for these two, for they come from the same source. Theirs always increases and never decreases. As Allah said,
الْأَخِلَّاء يَوْمَئِذٍ بَعْضُهُمْ لِبَعْضٍ عَدُوٌّ إِلَّا الْمُتَّقِينَ
because the root of love is being free of everything except the Beloved.
The Commander of the Faithful said, 'The best thing in the Garden and the sweetest is love of Allah, love in Allah, and praise for Allah.' And Allah has said,
وَآخِرُ دَعْوَاهُمْ أَنِ الْحَمْدُ لِلّهِ رَبِّ الْعَالَمِينَ
because when they see the blessings that exist in the Garden, love is aroused in their hearts and then they call out, 'Praise be to Allah, Lord of the worlds.'