" OBEY ALLAH AND HIS MESSENGER WITH NO DOUBT IN HEARTS

With the Name of Allah Almighty most merciful.
14. The desert Arabs say, "We believe." Say, "Ye have no faith; but ye (only)say, 'We have submitted our wills to Allah,' For not yet has Faith entered your hearts. But if ye obey Allah and His Messenger, He will not belittle aught of your deeds: for Allah is Oft-Forgiving, Most Merciful."
15. Only those are Believers who have believed in Allah and His Messenger, and have never since doubted, but have striven with their belongings and their persons in the Cause of Allah: Such are the sincere ones.
(Surah 49. The Private Apartments, The Inner Apartments)
source: http://www.islamicity.com/mosque/QURAN/49.htm#14

In this light, we come to know that what is faith that enter in hearts. Obeying of Allah and His Messenger, the Holy Prophet Hazrat Muhammad ( May Peace be upon Him) is necessary, obeying without doubt, compromise, reluctance. Than this world and the world hereafter will be peaceful: else; hovering diffrent problems, issues, tensions, hyper tension, physical disease, disappointment, series of risks, fears.
May Allah show us right path. AMEEN