"…objects we contemplate and that which contemplates are identical—both are thought. The subject cannot surely know an object different from itself. The world of ideas lies within our intelligence. Truth, therefore, is not the agreement of our apprehension of an external object with the object itself. It is the agreement of the mind with itself. Consciousness, therefore, is the sole basis of certainty: The mind is its own witness. Reason sees in itself that which is above itself as its source; and again, that which is below itself as still itself once more."