(noun) That which one is morally or legally obligated to do. Example: "We don't have a duty to keep you here."
"To be humble to superiors is a duty, to equals courtesy, to inferiors nobleness."
"I long to accomplish a great and noble task, but it is my chief duty to accomplish small tasks as if they were great and noble."
"When a stupid man is doing something he is ashamed of, he always declares that it is his duty."
"Where are our Men of abilities? Why do they not come forth to save their Country?"
"The things that will destroy America are prosperity at any price, peace at any price, safety first instead of duty first and love of soft living and the get-rich-quick theory of life."
"Great corporations exist only because they are created and safeguarded by our institutions; and it is therefore our right and duty to see that they work in harmony with these institutions."
"Let us have faith that right makes might; and in that faith let us, to the end, dare to do our duty as we understand it."
"To persevere in one's duty, and be silent is the best answer to calumny."
"Men exist for the sake of one another."
"To encourage literature and the arts is a duty which every good citizen owes to his country."
"Human happiness and moral duty are inseparably connected."
"One painful duty fulfilled makes the next plainer and easier."