Entities must not be multiplied beyond necessity.
Plurality is not to be posited without necessity.
Whenever two hypotheses cover the facts, use the simpler of the two.
Entities are not to be multiplied beyond necessity.
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.
Of two equivalent theories or explanations, all other things being equal, the simpler one is to be preferred.