But these few are the salt of the earth; without them, human life would become a stagnant pool. Not only is it they who introduce good things which d… - John Stuart Mill

A party of order or stability, and a party of progress or reform, are both necessary elements of a healthy state of political life.

Truth, in the great practical concerns
of life, is so much a question of the reconciling and
combining of opposites, that very few have minds sufficiently
capacious and impartial to make the adjustment with an
approach to correctness, and it has to be made by the rough
process of a struggle between combatants fighting under
hostile banners.

So long as an opinion is strongly rooted in the feelings, it gains rather than loses in stability by having a preponderating weight of argument against it.