James Chastek, Determination by Habit:

Though this can be taken in more than one way, one literal reading is that “Servant of justice” is said only “because of the infirmity of your flesh”. Servitude is properly only of evil habits; good habits are precisely what constitute liberty and freedom. The fatal mistake of habits is to see the slavery and bondage of the habits we know best as characteristic of all human habits. This is yet another way in which we confuse what is most known to us with what is most knowable in itself.