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Formal reality
a Cartesian distinction between the degree of reality a thing possesses in itself (formal reality) and the degree of reality an idea has by virtue of what it represents (objective reality). In the trademark argument, Descartes uses this distinction to argue that the idea of God, which has infinite objective reality, requires a cause with infinite formal reality, pointing to God as the only adequate cause.
Natural theology
Natural theology is the attempt to establish truths about God's existence and attributes through reason and observation of the natural world, without relying on divine revelation or scripture.
Ontological argument
The ontological argument is an a priori proof for the existence of God that proceeds from the concept of God alone, without relying on empirical observation. Descartes' version in Meditation V argues that because God possesses all perfections and existence is a perfection, God necessarily exists.