question #1 Sahih Muslim 78, Book 1, Hadith 146 : What is the significance of love for ‘Ali in determining one’s faith according to Islamic teachings?

‘Ali observed: By Him Who split up the seed and created something living, the Apostle (may peace and blessings be upon him) gave me a promise that no one but a believer would love me, and none but a hypocrite would nurse grudge against me.