From him...

[7] The Treats of a praiseworthy believer: وَ قَالَ ع‏ طُوبَى لِمَنْ ذَلَّ فِي نَفْسِهِ وَ طَابَ كَسْبُهُ وَ صَلَحَتْ سَرِيرَتُهُ وَ حَسُنَتْ خَلِيقَتُهُ وَ أَنْفَقَ الْفَضْلَ مِنْ مَالِهِ وَ أَمْسَكَ الْفَضْلَ مِنْ لِسَانِهِ وَ عَزَلَ عَنِ النَّاسِ شَرَّهُ وَ وَسِعَتْهُ السُّنَّةُ وَ لَمْ يُنْسَبْ إلَى الْبِدْعَةِ (Amir ul-Momineen -asws said – Nahjul Balagha) And he -asws said: ‘Beatitude is for one who is humble in his soul, and his earnings are good, and his heart is righteous, and his manners are excellent, and he spends from the surplus of his wealth, and withholds the surplus from his tongue, and isolates his evil away from the people, and his striving is the Sunnah, and he does not attribute (support) to an innovation Bid’ah)’’ .

[8] The Sunnah is of two types: عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ النَّوْفَلِيِّ عَنِ السَّكُونِيِّ عَنْ أَبِي عَبْدِ اللَّهِ عَنْ آبَائِهِ ( عليهم السلام ) قَالَ قَالَ أَمِيرُ الْمُؤْمِنِينَ ( عليه السلام ) السُّنَّةُ سُنَّتَانِ سُنَّةٌ فِي فَرِيضَةٍ الْأَخْذُ بِهَا هُدًى وَ تَرْكُهَا ضَلَالَةٌ وَ سُنَّةٌ فِي غَيْرِ فَرِيضَةٍ الْأَخْذُ بِهَا فَضِيلَةٌ وَ تَرْكُهَا إِلَى غَيْرِ خَطِيئَةٍ Ali Bin Ibrahim, from his father, from Al Nowfal, from Al Sakuny, from; Abu Abdullah -asws , from his -asws forefathers -asws having said: ‘Amir Al-Momineen -asws said: ‘The Sunnah are two (types of) Sunnah – A Sunnah regarding an Obligation, the taking by it is guidance and the neglecting it is a straying; and a Sunnah regarding other than an Obligation, the taking by it is a merit but there is no harm if one is unable to practise’.

[9] How do we get to know the Sunnah? It’s from Ahadith; وَ قَالَ ع‏ اعْقِلُوا الْخَبَرَ إِذَا سَمِعْتُمُوهُ عَقْلَ رِعَايَةٍ لَا عَقْلَ رِوَايَةٍ فَإِنَّ رُوَاةَ الْعِلْمِ كَثِيرٌ وَ رُعَاتَهُ قَلِيلٌ‏ And he (Ali Amir ul-Momineen -asws ) said: ‘Understand the Hadeeth when you hear it – the understanding of a follower (but) not understanding of a reporter, for the reporters of the knowledge are many, but its followers are few’’.