Double aspect theory

In the philosophy of mind, double aspect theory is a monistic (though property dualistic) theory strongly associated with Baruch Spinoza that holds that the mind and the body are the same thing known in two different ways - those ways being the subjective (as 1st person knowledge) and the objective (as 3rd person or empirical knowledge), respectively. This entails that full empirical knowledge is insufficient for understanding consciousness, and follows from his metaphysical parallelism, whereby everything ("God or Nature") manifests as two distinct attributes: thought (change in consciousness) and extension (change in space-time).