Self-reflection and contentment in Islamic teachings
Nahj al-Balāgha|Volume 1|Book 3|Chapter 349
وَالْقَنَاعَةُ مَالٌ لَا يَنْفَدُ، وَمَنْ أَكْثَرَ مِنْ ذِكْرِ الْمَوْتِ رَضِيَ مِنَ الدُّنْيَا بِالْيَسيرِ، وَمَنْ عَلِمَ أَنَّ كَلاَمَهُ مِنْ عَمَلِهِ قَلَّ كَلاَمُهُ إِلَّا فِيَما يَعْنيِهِ.
Contentment is a capital that does not dwindle. He who remembers death much is satisfied with small favours in this world. He who knows that his speech is also a part of his action speaks less except where he has some purpose.