the eighteenth century liberals stressed?

Answer 1

However, movements generally labeled as truly "liberal" date from the Enlightenment, particularly the Whig party in Britain, the philosophes in France, and the movement towards self-government in colonial America. These movements opposed absolute monarchy, mercantilism, and various kinds of religious orthodoxy and clericalism. They were also the first to formulate the concepts of individual rights under the rule of law, as well as the importance of self-government through elected representatives.
The definitive break with the past was the conception that free individuals could form the foundation for a stable society. This idea is generally dated from the work of John Locke (1632-1704), whose Two Treatises on Government established two fundamental liberal ideas: economic liberty, meaning the right to have and use property, and intellectual liberty, including freedom of conscience, which he expounded in A Letter Concerning Toleration (1689). However, he did not extend his views on religious freedom to Roman Catholics . Locke developed further the earlier idea of natural rights, which he saw as "life, liberty and property". His "natural rights theory" was the distant forerunner of the modern conception of human rights. However, to Locke, property was more important than the right to participate in government and public decision-making: he did not endorse democracy, because he feared that giving power to the people would erode the sanctity of private property. Nevertheless, the idea of natural rights played a key role in providing the ideological justification for the American revolution and the French revolution.
On the European continent, the doctrine of laws restraining even monarchs was expounded by Charles de Secondat, Baron de Montesquieu, whose The Spirit of the Laws argues that "Better is it to say, that the government most conformable to nature is that which best agrees with the humour and disposition of the people in whose favour it is established," rather than accept as natural the mere rule of force. Following in his footsteps, political economist Jean-Baptiste Say and Destutt de Tracy were ardent exponents of the "harmonies" of the market, and in all probability it was they who coined the term laissez-faire. This evolved into the physiocrats, and to the political economy of Rousseau.
The late French enlightenment saw two figures who would have tremendous influence on later liberal thought: Voltaire who argued that the French should adopt constitutional monarchy, and disestablish the Second Estate, and Rousseau who argued for a natural freedom for mankind. Both argued, in different forms, for changes in political and social arrangements based around the idea that society can restrain a natural human liberty, but not obliterate its nature. For Voltaire the concept was more intellectual, for Rousseau, it was related to intrinsic natural rights, perhaps related to the ideas of Diderot.
Rousseau also argued the importance of a concept that appears repeatedly in the history of liberal thought, namely, the social contract. He rooted this in the nature of the individual and asserted that each person knows their own interest best. His assertion that man is born free, but that education was sufficient to restrain him within society, rocked the monarchical society of his age. His assertion of an organic will of a nation argued for self-determination of peoples, again in contravention of established political practice. His ideas were a key element in the declaration of the National Assembly in the French Revolution, and in the thinking of Americans such as Benjamin Franklin and Thomas Jefferson. In his view the unity of a state came from the concerted action of consent, or the "national will". This unity of action would allow states to exist without being chained to pre-existing social orders, such as aristocracy.
A main contributing group of thinkers whose work would become considered part of liberalism are those associated with the "Scottish Enlightenment", including the writers David Hume and Adam Smith, and the German enlightenment philosopher Immanuel Kant.
David Hume's contributions were many and varied, but most important was his assertion that fundamental rules of human behavior would overwhelm attempts to restrict or regulate them, in A Treatise of Human Nature, 1739-1740. One example of this is in his disparaging of mercantilism, and the accumulation of gold and silver. He argued that prices were related to the quantity of money, and that hoarding gold and issuing paper money would only lead to inflation.
Although Adam Smith is the most famous of the economic liberal thinkers, he was not without antecedents. The physiocrats in France had proposed studying systematically political economy and the self organizing nature of markets. Benjamin Franklin wrote in favor of the freedom of American industry in 1750. In Sweden-Finland the period of liberty and parliamentary government from 1718 to 1772 produced a Finnish parliamentarian, Anders Chydenius, who was one of the first to propose free trade and unregulated industry, in The National Gain, 1765. His impact has proven to be lasting particularly in the Nordic area, but it also had a powerful effect in later developments elsewhere.
The Scotsman Adam Smith (1723–1790) expounded the theory that individuals could structure both moral and economic life without direction from the state, and that nations would be strongest when their citizens were free to follow their own initiative. He advocated an end to feudal and mercantile regulations, to state-granted monopolies and patents, and he promulgated "laissez-faire" government. In The Theory of Moral Sentiments, 1759, he developed a theory of motivation that tried to reconcile human self-interest and an unregulated social order. In The Wealth of Nations, 1776, he argued that the market, under certain conditions, would naturally regulate itself and would produce more than the heavily restricted markets that were the norm at the time. He assigned to government the role of taking on tasks which could not be entrusted to the profit motive, such as preventing individuals from using force or fraud to disrupt competition, trade, or production. His theory of taxation was that governments should levy taxes only in ways which did not harm the economy, and that "The subjects of every state ought to contribute towards the support of the government, as nearly as possible, in proportion to their respective abilities; that is, in proportion to the revenue which they respectively enjoy under the protection of the state." He agreed with Hume that capital, not gold, is the wealth of a nation.
Immanuel Kant was strongly influenced by Hume's empiricism and rationalism. His most important contributions to liberal thinking are in the realm of ethics, particularly his assertion of the categorical imperative. Kant argued that received systems of reason and morals were subordinate to natural law, and that, therefore, attempts to stifle this basic law would meet with failure. His idealism would become increasingly influential, since it asserted that there were fundamental truths upon which systems of knowledge could be based. This meshed well with the ideas of the English Enlightenment about natural rights.


More at the link below

Answer 2

I was going to write a lot, but give it to answer #1. That's pretty much exactly what I was going to say.

Answer 3

the natural rights of life, liberty, and property

Answer 4

I don't understand your point?