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William of Ockham No more things should be presumed to exist than are absolutely necessary.
William of Ockham For nothing ought to be posited without a reason given, unless it is self-evident (literally, known through itself) or known by experience or proved by the authority of Sacred Scripture.
William of Ockham With all things being equal, the simplest explanation tends to be the right one.
William of Ockham The explanation requiring the fewest assumptions is most likely to be correct.