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. the declaration of independence this quote from the declaration of independence is referring to the principle of

 natural rights

Explanation:

A strong overall theme of the Declaration of Independence is that people are born with natural rights.  Perhaps the most memorable phrase from the Declaration is the one you quoted, which uses the term "unalienable rights" as an equivalent for natural rights.  Because  the rights belong to us by nature, we cannot be separated or alienated from those rights.

Thomas Jefferson (writer of the Declaration of Independence) and other American founding fathers got their ideas about natural rights from philosophers of the Enlightenment, such as John Locke (1632-1704).  Locke strongly argued that all human beings have certain natural rights which are to be protected and preserved.    Locke's ideal was one that promoted individual freedom and equal rights and opportunity for all.  Each individual's well-being (life, health, liberty, possessions) should be served by the way government and society are arranged.   The American founding fathers accepted the views of Locke and other Enlightenment thinkers and acted on them.

John Locke, in his Second Treatise on Civil Government (1690), expressed these ideas as follows.  Notice similarities to what is said in the Declaration of Independence (1776) ...

i beleive its 1)aids