Entities must not be multiplied beyond necessity.

When you have two competing theories that make exactly the same predictions, the simpler one is the better.

My God is the green tide in the spring leaves the redness of cherries high in the air the excitement of shooting stars the song of birds in summer branches the sunrise on a winter's morning the name of everything we don't understand.

The explanation requiring the fewest assumptions is most likely to be correct.

Pluralitas non est ponenda sine necessitate. A plurality (of reasons) should not be posited without necessity.

With all things being equal, the simplest explanation tends to be the right one.

Simpler explanations are, other things being equal, generally better than more complex ones.