A certain moral system holds that performing good actions is praiseworthy only when one overcomes a powerful temptation in order to perform them.
Given That ...
Performing a good action is only praiseworthy if one overcomes a powerful temptation in order to perform it (i.e. if you didn't have to overcome a powerful temptation to perform action A, then you don't deserve praise for performing action A).
How Can It Be That ...
Performing good actions out of habit is sometimes praiseworthy?
Evaluate
The moral principle in the first sentence is saying that an action is only praiseworthy if you had to overcome a temptation in order to perform it.
The surprise is that an action performed out of habit could ever be praiseworthy, which insinuates that actions performed out of habit wouldn't be expected to overlap with actions that involve overcoming a powerful temptation.
But maybe they do overlap! Maybe I have a habit of calling my mom on Sundays, and because I am strongly tempted to not call her but do anyway, it is a good action.
Goal
Find an answer that helps us show how actions performed out of habit could also be actions that overcome a powerful temptation.