God's existence cannot be deduced by reason alone.

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

3 is a prime, 5 is a prime, and 7 is a prime. Why bother with non-prime numbers when the primes can do everything?

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

Plurality is not to be posited without necessity.

Entities must not be multiplied beyond necessity.

It is vain to do with more what can be done with less.