It is like just one must have and wear the right and left feet shoes as you can't move / walk wearing only either left or right feet shoes. The life and walk is smooth and balanced when the rights and duties go together.
Rights and duties are complimentary and inseparable. If you discharge your duties well, you will automatically get the rights. The one is incomplete without the other. The chapter on the Fundamental Rights was enshrined / written in the constitution in the beginning itself. Whereas the Chapter of Fundamental Duties was added much later. As the citizen has the rights and duties, so has the state. The state government too is issued guidelines framed under the Directive Principles of State Policy. Every citizen has certain duties to perform towards state. I have been a student of Ethics and Civics. The citizens of a great nation must read these two subjects thoroughly. Since the school days the children must be taught Civics, Ethics, Rights and duties. These are must for smooth development of a nation.
It was important because it was about slavery, mainly about the expansion of slavery. These debates between Lincoln and Douglas were important to decide some things. Douglas believed in sovereignty, Lincoln that the national policy was to limit the spread of slavery.
The terms ´left´ and ´right´ date from the French Revolution, where the members of the National Assembly would sit accordingly to their own views on the monarchy; those whose views aligned with the dismantling of Louis XVI´s reign would sit on the left, while those loyal to the monarch would sit on the right.
