(noun) That which one is morally or legally obligated to do. Example: "We don't have a duty to keep you here."
"Love is a better master than duty."
"Human happiness and moral duty are inseparably connected."
"When a stupid man is doing something he is ashamed of, he always declares that it is his duty."
"Oh, Lizzy! do anything rather than marry without affection."
"One painful duty fulfilled makes the next plainer and easier."
"Gentlemen, you will permit me to put on my spectacles, for, I have grown not only gray, but almost blind in the service of my country."
"To persevere in one's duty, and be silent is the best answer to calumny."
"There is a love of wild nature in everybody, an ancient mother-love showing itself whether recognized or no, and however covered by cares and duties."
"Where are our Men of abilities? Why do they not come forth to save their Country?"
"When injustice becomes law, resistance becomes duty."
"Be with a leader when he is right, stay with him when he is still right, but, leave him when he is wrong."
"To be humble to superiors is a duty, to equals courtesy, to inferiors nobleness."