Most of the things we do, we do for no better reason than that our fathers have done them or that our neighbors do them, and the same is true of a larger part than we suspect of what we think. – Oliver Wendell Holmes, Jr.

The only man I know who behaves sensibly is my tailor; he takes my measurements anew each time he sees me. The rest go on with their old measurements and expect me to fit them. – George Bernard Shaw

New opinions are always suspected, and usually opposed, without any other reason but because they are not already common. – John Locke, An Essay Concerning Human Understanding