Abdullah ibn Mas'ud - Radhi-yallaahu 'anhu - said
يَنْبَغِي لحَامِلِ اَلْقُرْآنِ أَنْ يُعْرَفُ بِلَيْلِهِ إِذَا النَّاسُ نَائِمُونَ
The one who memorizes Quran must be known by his nights when the people are sleeping
وَ بِنِهَارِهِ إِذَا النَّاسُ مُفْطِرُونَ
by his days when the people are eating
وَ بِحُزْنِهِ إِذَا النَّاسُ يَفْرَحُونَ
by his sadness when the people are rejoicing
وَ بِبُكَائِهِ إِذَا النَّاسُ يَضْحَكُونَ
by his crying when the people are laughing
وَ بِصَمْتِهِ إِذَا النَّاسُ يَخُوضُونَ
by his silence when the people are chatting away
وَ بِخُشُوعِهِ إِذَا النَّاسُ يَخْتَالُونَ.ـ
and by his humility when the people are boasting
(اَلْتِّبْيَانُ)