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

Plurality should not be assumed without necessity.

Never increase, beyond what is necessary, the number of entities required to explain anything.

What can be explained by the assumption of fewer things is vainly explained by the assumption of more things.

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

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.

No more things should be presumed to exist than are absolutely necessary.