Thus a contradictory concept C is one which upon analysis can be found to have a property and the absence of that property. There is no guarantee that a concept is not contradictory, unless it can be analyzed into its simplest components. In fact, this is how Leibniz tried to show that God is possible, i.e., that the concept of God contains no contradiction. God is a being whose concept contains only positive predicates. There is no not-A among the characteristics of God, so there can be no contradiction in the concept of God.
Sense presents the world in a confused way, as in space and time.
Space and time are merely idealized orders of substances. The Transcendental Aesthetic , according to which space is a condition of objects in it, rather, than the objects' being required for space. Leibniz's view is found in his correspondence with Clarke, Third Paper. I hold it to be an order of coexistences, as time is an order of successions. We can never represent to ourselves the absence of space, though we can quite well think it as smpty of objects.