A motivating awareness of ethical responsibility(noun)
WordNet. Princeton University. 2010.
Use "sense of duty" in a sentence
"Unbiassed by party considerations or personal prejudices, and only influenced by a sense of duty and wish to do right, it was impossible he could be otherwise than popular."
"Now it was in darkness, but the sound of regular snoring from the stoveside chair announced that Detective Officer Corkerdale was impervious both to a sense of duty and the fear of asphyxiation."
"Near the exit, as he came out, was a hot-waffle stand which he had overlooked, and a sense of duty obliged him to consume the three waffles, thickly powdered with sugar, which the waffle man cooked for him upon command."