The Constitution of the United States was made not merely for the generation that then existed, but for posterity- unlimited, undefined, endless, perpetual posterity.
— Henry Clay

The President can exercise no power which cannot be fairly and reasonably traced to some specific grant of power in the Federal Constitution or in an act of Congress passed in pursuance thereof. There is no undefined residuum of power which he can exercise because it seems to him to be in the public interest.
William Howard Taft undefined quote

A modern democracy is a tyranny whose borders are undefined; one discovers how far one can go only by traveling in a straight line until one is stopped.
— Norman Mailer

All public interest legislation (and any distribution of money taken by force from some men for the unearned benefit of others) comes down ultimately to the grant of an undefined undefinable, non-objective, arbitrary power to some government officials. The worst aspect of it is not that such a power can be used dishonestly, but that it cannot be used honestly. The wisest man in the world, with the purest integrity, cannot find a criterion for the just, equitable, rational application of an unjust, inequitable, irrational principle.
— Ayn Rand

Man's role is uncertain, undefined, and perhaps unnecessary.
— Margaret Mead