One great virtue to cultivate is perfectionism: the setting of excellent ideals and solidly working towards them.
The devil will want me to call perfectionism a defect and make a virtue of settling for unnecessary defectiveness and mediocrity.
He would rather I continue to suffer, 'sitting with my feelings' (really his feelings he has whispered into my ear), putting up with perfectly solvable problems, and spending my time talking about my difficulties rather than striving to do something about them, right here, right now.
Errors and failures on this path are to be spotted and corrected.
Provided I refrain from chastising myself for such inevitable errors and failures, perfectionism need never give me a moment's negative feeling.