… is from page 253 of the 2016 second edition of Thomas Sowell’s excellent volume Wealth, Poverty and Politics (original emphasis):
Governments can readily do things which depend on force, such as fighting wars, punishing criminals or confiscating wealth. However, power is limited in its effects not only by opposing power but also by knowledge – or, rather, by the limits of knowledge available to a given power holder.
DBx: No truth is more ignored – and ignored to dangerous effects – than is the one here identified by Sowell.