"A sense of duty imprisons you" says NY artist Jenny Holzer. That is certainly what many of us most fear. ............
However, the role of DUTY is not to restrict or limit our relationships as Nietzsche may have feared. Nor is a sense of DUTY doomed to suffocate the authenticity of our feelings, as many of us instinctively fear.
Rather DUTY acts as a "shorthand" description of what KIND of good we are trying to achieve for others, within each specific KIND of relationship (Romans 15:1-2).
Still, for all the help that Duty can give us in directing our relationships for the good of others, DUTY by itself is never enough to guarantee the health of our relationships, nor their full flourishing.
We can just as easily use the idea of Duty as a justification to AVOID seeking the good of others (Luke 10:29). Love alone can free Duty to exceed the limits of demand (Romans 13:8).