Liberty

 Montesquieu says that true freedom is not good or practical and laws are required and liberty is freedom with guidelines it is similar to how some monarchies run themselves the monarch has total power with a few restrictions/limitations. He also has a dim view of tyrants and he doesn't seem to be in love with the idea of purity in political matters such as he doesn't like pure power to the heads of government nor does he want pure freedom to the people because it seems that he acknowledges humans imperfections and sees that people will take advantage when given the chance. He sees anything done not through necessity as tyrannical and he does not think highly of that. Our own goverment seems to be modeled after this way of thinking almost exactly the constitution seems to give everyone exactly what Montesquieu says he wants a system where there is no absolute power and every citizen can pursue an interest they like as long as it brings no intentional physical harm to other people. 

Liberty is something that is very important to the people who have experienced it and people who haven't wish they could because we as people like to be free to be able to spread our wings and fly to where we want. It is something that makes America unique and why so many people want to and still do live in it. "Give me liberty or give me death" - Patrick Henry