 In his Lectures on the Philosophical Doctrine of Religion, Kant defines “Transcendental Theology” as the “recognition [Kenntniss] of God by means of concepts of pure reason” (AK 28:596 [1821]). These concepts are not, however, the pure concepts of the understanding, but rather what he calls the four “classes of concepts” (B110): namely, quantity, quality, relation and modality. More precisely, Kant sees Transcendental Theology as a consequence of reason’s quest for the unconditioned condition, with its concepts of God corresponding to the unconditioned for each of the “classes of concepts”, namely: ens summum (quality), ens entium (quantity), ens originarium (modality), and ens realissimum (relation).