Doing Good Deeds Continuously
Abdullah bin Amr bin Al-as (radi Allahu anhum) said, “The Messenger of Allah (sal Allahu alaihi wa sallam) said to me, ‘O Abdullah! Do not be like so-and-so. He used to get up at night for optional prayer but abandoned it later.’”
[Sahih Al-Bukhari and Muslim]
The excellence of manners demands that if someone has something reprehensible in his character, the person concerned should not be mentioned but the shortcoming must be indicated so that people refrain from it. The second point that we learn from this Hadith is that if one starts a good deed, he should try his best to do it continually because its continuation is liked by Allah.
And Allah Knows Best!