… is from page 3 of Milton and Rose Friedman’s essential 1962 book, Capitalism and Freedom:
The power to do good is also the power to do harm; those who control the power today may not tomorrow; and, more important, what one man regards as good, another may regard as harm. The great tragedy of the drive to centralization, as of the drive to extend the scope of government in general, is that it is mostly led by men of good will who will be the first to rue its consequences.
DBx: Why this reality is overlooked by politicians isn’t a mystery: Their horizon seldom extends beyond the next election. Why this reality is overlooked by so very many nonpoliticians is a great mystery.