When weeding a vegetable garden, one should not try to remove all the weeds  It is true that the more weeds, the less productive the garden
Nevertheless, avoiding the painstaking effort of finding and pulling every single weed more than compensates for the slight productivity loss resulting from leaving a few
If one is trying to improve one's personality by removing imperfections, one should not try to remove them all. For while each imperfection makes one's personality worse, it is no longer worth one's time to remove imperfections if there are only a few left.