§ "Every individual necessarily labors to render the annual revenue of the society as great as he can. He generally indeed neither intends to promote the public interest, nor knows how much he is promoting it. He intends only his own gain, and he is in this, as in many other cases, led by an invisible hand to promote an end which was no part of his intention. By pursuing his own interest he frequently promotes that of the society more effectually than when he really intends to promote it. I have never known much good done by those who affected to trade for the public good."(The Wealth of Nations).
§ "All systems either of preference or of restraint, therefore, being thus completely taken away, the obvious and simple system of natural liberty establishes itself of its own accord. Every man, as long as he does not violate the laws of justice, is left perfectly free to pursue his own interest his own way, and to bring both his industry and capital into competition with those of any other man or order of men. The sovereign [politician] is completely discharged from a duty, in the attempting to perform which he must always be exposed to innumerable delusions, and for the proper performance of which no human wisdom or knowledge could ever be sufficient: the duty of superintending the industry of private people." (The Wealth of Nations, vol. II, bk. IV, ch. 9.)
§ "A monopoly granted either to an individual or to a trading company has the same effect as a secret in trade or manufactures. The monopolists, by keeping the market constantly understocked, by never fully supplying the effectual demand, sell their commodities much above the natural price, and raise their emoluments, whether they consist in wages or profit, greatly above their natural rate." (vol. I, bk. I, ch. 7.)
§ "People of the same trade seldom meet together, even for merriment and diversion, but the conversation ends in a conspiracy against the public, or in some contrivance to raise prices. It is impossible indeed to prevent such meetings by any law which either could be executed, or would be consistent with liberty and justice." (vol. I, bk. I, ch. 10.)
Nature of Man:-
§ "The propensity to truck, barter and exchange one thing for another is common to all men, and to be found in no other race of animals."
§ "It is the highest impertinence and presumption, therefore, in kings and ministers [read politicians] to pretend to watch over the economy of private people, and to restrain their expense. They are themselves always, and without any exception, the greatest spendthrifts in the society. Let them look well after their own expense, and they may safely trust private people with theirs." (vol. I, bk. II, ch. 3.)
§ "Science is the great antidote to the poison of enthusiasm and superstition." (The Wealth of Nations.)
§ "A system of natural philosophy [this is how they described science in those days] may appear very plausible, and be for a long time very generally received in the world, and yet have no foundation in nature, nor any sort of resemblance to the truth." (Theory of Moral Sentiments.)