Allah's Apostle ﷺ said to me: Don't consider anything insignificant out of good things even if it is that you meet your brother with a cheerful countenance.  

لِيَ النَّبِيُّ ﷺ لاَ تَحْقِرَنَّ مِنَ الْمَعْرُوفِ شَيْئًا وَلَوْ أَنْ تَلْقَى أَخَاكَ بِوَجْهٍ طَلْقٍ