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|This page in a nutshell: Don't change something until you understand why it is the way it is. There may be a valid reason for it to be that way.|
Chesterton's fence is the principle that reforms should not be made until the reasoning behind the existing state of affairs is understood. The quotation is from G. K. Chesterton's 1929 book The Thing, in the chapter entitled "The Drift from Domesticity":
In the matter of reforming things, as distinct from deforming them, there is one plain and simple principle; a principle which will probably be called a paradox. There exists in such a case a certain institution or law; let us say, for the sake of simplicity, a fence or gate erected across a road. The more modern type of reformer goes gaily up to it and says, "I don't see the use of this; let us clear it away." To which the more intelligent type of reformer will do well to answer: "If you don't see the use of it, I certainly won't let you clear it away. Go away and think. Then, when you can come back and tell me that you do see the use of it, I may allow you to destroy it."
Chesterton's admonition should first be understood within his own historical context, as a response to certain socialists and reformers of his time (e.g. George Bernard Shaw).
What this means on WikipediaEdit
If you're considering nominating something for deletion, or changing a policy, because it doesn't appear to have any use or purpose, research its history first. You may find out why it was created, and perhaps understand that it still serves a purpose. If you believe the issue it addressed is no longer valid, frame your argument for deletion in a way that acknowledges that.
- "Taking a Fence Down". American Chesterton Society. Retrieved 21 June 2014.