“Libertarians (like anarchists and Marxists) generally believe that human nature is good, though damaged by certain social institutions. Conservatives, on the contrary, hold that "in Adam's fall we sinned all": human nature, though compounded of both good and evil, is irremediably flawed; so the perfection of society is impossible, all human beings being imperfect.”

“The major flaw with human beings is that despite all our cleverness and ingenuity we both tell and believe lies.”

“About the nature of human beings. I discovered that confronted by temptation, we will always fall. Given the right circumstances, every human being on this earth would be willing to commit evil.”

“It is human nature. If we surround ourselves with evil, even evil becomes good to us. If we are not careful, that natural light witin us all that teaches us the difference between the two can be snuffed out completely. Even the best of people can fall.”

“...capitalism satisfied the Christian demand for an institution that channels selfish human desire toward the betterment of society. Some critics accuse capitalism of being a selfish system, but the selfishness is not in capitalism - it is in human nature.”

“For the anarchist, freedom is not an abstract philosophical concept, but the vital concrete possibility of every human being to bring to full development all the powers, capacities and talents with which nature has endowed them, and turn them to social account.”