Imam ‘Ali (a.s.) said:
خَيْرُ ما وَرَثَ الآباءُ لِلأَبْناءَ الأَدَبَ
The best heritage which fathers leave for their children is courtesy. 1
Courtesy refers to proper behavior in all encounters and relationships and is associated with respect and honor. Courtesy is concerned with interactions with fellow human beings as well as with God. In both cases, courteous behavior is one of the most valuable asset one can possess…it is the key to success in all fields.
On this account, Imam ‘Ali (a.s.) has described courtesy as the highest heritage which a father leaves for his child. Courtesy is the source of affection, sincerity, friendship, and unity and an important factor in effectiveness of speech and progress in social objectives.