Hawzah News Agency – Imam al-Rida peace be upon him says:

لا يكونُ المؤمنُ مؤمناً حتّى‏ تكونَ فيه ثلاثُ خِصالٍ: سُنّةٌ مِن ربِّهِ، وسُنّةٌ مِن نبيِّهِ صلى اللَّه عليه وآله، وسنّةٌ مِن وليِّهِ عليه السلام؛ فأمّا السُّنَّةٌ مِن ربّهِ فكِتْمانُ السِّرِّ، وأمّا السُّنَّةُ مِن نبيِّه صلى اللَّه عليه وآله فمُداراةُ النّاسِ، وأمّا السُّنَّةُ مِن وليِّهِ عليه السلام فالصَّبرُ في البَأْساءِ والضَّرّاءِ.

'The believer is not a believer until he possesses three qualities: a practice [characteristic] of his Lord, a practice of his Prophet (SAWA), and a practice of his guardian (AS). As for the practice of his Lord, it is to conceal secrets; the practice of his Prophet (SAWA) is amicableness towards people; and the practice of his guardian (AS) is patience in both times of ease and difficulty.'

Source: Tuhaf al-Uqul, no. 442