Sweetness of iman

In the same way that love of the Prophet, sallallaahu `alayhi wa sallam, is a reason for attaining the good of this world and the Hereafter, then loving him is also a reason for achieving the sweetness of eemaan.

Al-Bukhaaree and Muslim both related from Anas, radiyallaahu `anhu, that the Prophet, sallallaahu `alayhi wa sallam, said: Whoever possesses the following three qualities will taste the sweetness (delight) of eemaan: One to whom Allaah and His Messenger, sallallaahu `alayhi wa sallam, become dearer than anything else; Whoever loves his brother solely for Allaah's sake; and whoever hates to revert to disbelief just as he hates to be thrown into the Fire. [al-Bukhaaree 1/60, Muslim 166, and the wording is from al-Bukhaaree]

The meaning of "sweetness of eemaan", as the scholars, rahimahumallaah, have stated is: Deriving pleasure from obedience, to endure hardship in religion and preferring this over worldly things. [See Sharh un-Nawawee (2/13) and Fath ul-Baaree (1/16)]