What argument does thomas jefferson make in this excerpt from the declaration of independence?

we hold these truths to be self-evident, that all men are created equal, that they are endowed by their creator with certain unalienable rights, that among these are life, liberty and the pursuit of to secure these rights, governments are instituted among men, deriving their just powers from the consent of the governed, --that whenever any form of government becomes destructive of these ends, it is the right of the people to alter or to abolish it, and to institute new government,