Intuitive cognition of a thing is cognition that enables us to know whether the thing exists or does not exist, in such a way that, if the thing exists, then the intellect immediately judges that it exists and evidently knows that it exists, unless the judgment happens to be impeded through the imperfection of this cognition.

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

Plurality should not be assumed without necessity.

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

Whenever two hypotheses cover the facts, use the simpler of the two.

Entities must not 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.