If it is true that...

Everything the existence of which is other than its own nature has existence from another

and

There is something that is the cause of existing in all things in that this thing is existence only

Then it must be true that...

The intelligences are form and existence and have existence from the first being, which is existence alone, and this is the first cause, which is God

If it is true that...

Everything that pertains to a thing either is caused by the principles of its own nature or comes from some extrinsic principle

and

Everything the existence of which is other than its own nature has existence from another

Then it must be true that...

There is something that is the cause of existing in all things in that this thing is existence only