On guarding against your own mistakes

While everyone well knows himself to be fallible, few think it necessary to take any precautions against their own fallibility, or admit the supposition that any opinion, of which they feel very certain, may be one of the examples of the error to which they acknowledge themselves to be liable.

—John Stuart Mill, On Liberty

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Programming is hard.

Even if we could invent a programming language that used the same terminology as the real-world problem we’re trying to solve, programming would still be difficult because of the challenge in determining precisely how the real world works.

—Steve McConnell, Code Complete