 Were the reader to continue beyond the opening propositions of the Observations, he would encounter elements of another, older tradition: references to “perfect self-annihilation, and the pure love of God” (OM 2, prop. 67), and quotations of select biblical passages, especially the promise of becoming “partakers of the divine nature” (2 Pet. 1.4). These place Hartley within the realms of pietism and mysticism.