A paragraph under the above heading, by Ludwig von Mises; from an essay named 'Liberty and its Antithesis'.
Western civilization is based upon the libertarian principle and all its achievements are the result of the actions of free men. Only in the frame of a free society is it meaningful to distinguish between what is good and ought to be done and what is bad and ought to be avoided. Only in such a free society has the individual the power to choose between morally commendable and morally reprehensible conduct.
Man is not a perfect being and there is no perfection in human affairs. Conditions in the free society are certainly in many regards unsatisfactory. There is still ample room for the endeavors of those who are intent upon fighting evil and raising the moral, intellectual, and material level of mankind.
Found in the the collection "Economic Freedom and Intervention", published by Liberty Fund, and viewable here at their own Online Library of Liberty.