Attaining a higher rank
The Prophet (sal Allahu alaihi wa sallam) said, “A believer will attain by his good behavior the rank of one who prays during the night and observes fasting during the day.”
[Sunan Abu Dawud]
The two above practices are difficult. But those who manage to keep them will be richly rewarded by Allah.
There is a third category of men who fail to observe the above mentioned voluntary practices. Yet they are polite, and courteous in their behavior towards others and by virtue of this sociable quality, they will also be graded up in the two other categories.
This highlights the significance and excellence of a polite and pleasing behavior.
And Allah knows best!