Selections from Orthodoxy, by G.K. Chesterton (the second is of particular moment to the discussion we were having).
Last and most important, it is exactly this which explains what is so inexplicable to all the modern critics of the history of Christianity. I mean the monstrous wars about small points of theology, the earthquakes of emotion about a gesture or a word. It was only a matter of an inch; but an inch is everything when you are balancing. The Church could not afford to swerve a hair's breadth on some things if she was to continue her great and daring experiment of the irregular equilibrium. Once let one idea become less powerful and some other idea would become too powerful. . . . Here it is enough to notice that if some small mistake were made in doctrine, huge blunders might be made in human happiness. A sentence phrased wrong about the nature of symbolism would have broken all the best statues in Europe. A slip in the definitions might stop all the dances; might wither all the Christmas trees or break all the Easter eggs. Doctrines had to be defined with strict limits, even in order that man might enjoy general human liberties. The Church had to be careful, if only that the world might be careless.
This is the thrilling romance of Orthodoxy. People have fallen into a foolish habit of speaking of orthodoxy as something heavy, humdrum, and safe. There never was anything so perilous or so exciting as orthodoxy. It was sanity: and to be sane is more dramatic than to be mad. It was the equilibrium of a man behind madly rushing horses, seeming to stoop this way and to sway that, yet in every attitude having the grace of statuary and the accuracy of arithmetic. the Church in its early days went fierce and fast with any warhorse; yet it is utterly unhistoric to say that she merely went mad along one idea, like a vulgar fanatacism. She swerved to left and right, so exactly as to avoid enormous obstacles. She left on one hand the huge bulk of Arianism, buttressed by all the worldly powers to make Christianity too worldly. The next instant she was serving to avoid an orientalism, which would have made it too unworldly. The orthodox Church never took the tame course or accepted the conventions; the orthodox Church was never respectable. It would have been easier to have accepted the earthly power of the Arians. It would have been easy, in the Calvinistic seventeenth century, to fall into the bottomless pit of predestination. It is easy to be a madman: it is easy to be a heretic. It is always easy to let the age have its head; the difficult thing is to keep one's own. It is always easy to be a modernist; as it is easy to be a snob. To have fallen into any of those open traps of error and exaggeration which fashion after fashion and sect after sect set along the historic path of Christendom -- that would indeed have been simple. It is always simple to fall; there are an infinity of angles at which one falls, only one at which one stands. To have fallen into any one of the fads from Gnosticism to Christian Science would indeed have been obvious and tame. But to have avoided them all has been one whirling adventure; and in my vision the heavenly chariot flies thundering through the ages, the dull heresies sprawling and prostrate, the wild truth reeling but erect.
-- "The Paradoxes of Christianity"
A strict rule is not only necessary for ruling; it is also necessary for rebelling. This fixed and familiar ideal is necessary to any sort of rebellion. Man will sometimes act slowly upon new ideas; but he will only act swiftly upon old ideas.