IX . It is a greater and more difficult thing to create or conserve a substance than to create or conserve its attributes or properties; but this creation of a thing is not greater or more difficult than its conservation, as has been already said.

X . In the idea or concept of a thing existence is contained, because we are unable to conceive anything unless under the form of a thing which exists; but with this difference that, in the concept of a limited thing, possible or contingent existence is alone contained, and in the concept of a being sovereignly perfect, perfect and necessary existence is comprised.

Proposition I

The existence of God is known from the consideration of his nature alone.

Demonstration