Occam's razor (a.k.a.: Ockham's razor )

The simplest answer is usually the correct answer

Simplicity is the ultimate sophistication

Of two equivalent theories or explanations, all other things being equal, the simpler one is to be preferred

We are to admit no more causes of natural things than such as are both true and sufficient to explain their appearances

The simplest explanation is usually the best

The simplest explanation that covers all the facts