(Blatantly stolen from Wikipedia)
The idea that certain rights are natural or inalienable also has a history dating back at least to the Stoics of late Antiquity and Catholic law of the early Middle Ages, and descending through the Protestant Reformation and the Age of Enlightenment to today.[ citation needed ]
The existence of natural rights has been asserted by different individuals on different premises, such as a priori philosophical reasoning or religious principles. For example, Immanuel Kant claimed to derive natural rights through reason alone. The United States Declaration of Independence, meanwhile, is based upon the “self-evident” truth that “all men are … endowed by their Creator with certain unalienable Rights”.
Likewise, different philosophers and statesmen have designed different lists of what they believe to be natural rights; almost all include the right to life and liberty as the two highest priorities. H. L. A. Hart argued that if there are any rights at all, there must be the right to liberty, for all the others would depend upon this. T. H. Green argued that “if there are such things as rights at all, then, there must be a right to life and liberty, or, to put it more properly to free life.” John Locke emphasized “life, liberty and property” as primary. However, despite Locke’s influential defense of the right of revolution, Thomas Jefferson substituted “pursuit of happiness” in place of “property” in the United States Declaration of Independence.