Dr. Vicesimus Knox, in his Christian Philosophy, after a long citation from the Inward Witness to Christianity, concludes thus:—“For my own part, I cannot but think this good man approached as nearly to christian perfection as any mortal ever did in this sublunary state; and therefore I consider him as a better interpreter of the christian doctrines than the most learned critics, who, proud of their reason and their learning, despised or neglected the very life and soul of christianity, the living, everlasting gospel, the supernatural operation of divine grace; and be it ever remembered, that Dr. Watts was a man who cultivated his reason with particular care, who studied the abstrusest sciences, and was as well qualified to become a verbal critic, or a logical disputant on the scriptures, as the most learned among the doctors of Sorbonne, or the greatest proficients in polemical divinity. I mentioned this circumstance for the consideration of those who insinuate that the doctrines of grace cannot be entertained but by ignorant as well as fanatical persons; by persons uninitiated in the mysteries of philosophy.” His Theological Works are numerous, and none of them appear to have been hurried into the world under the impulse of a thoughtless vanity. The perspicuity and elegance of his expression and the richness of his imagination, enliven the most common subjects, and add lustre to the most interesting. The multiplicity and diversity of his native and acquired talents are every where conspicuous; and the application of these talents uniformly discovers an accurate knowledge of human nature, a high veneration of the gospel, an unshaken attachment to the cause of christian liberty, and an habitual readiness for any sacrifice to the virtue and happiness of the world. While exploring the most abstruse subjects of corporeal and spiritual nature, he became a teacher of babes; and that wayfaring men, though almost ideots, might not err in the path of life, he laid aside the metaphysician and the philosopher, to explain the doctrines and familiarise the history of the bible. “Whatever he took in hand was, by incessant solicitude for souls, converted to theology; it is difficult to read a page without learning, or at least wishing, to be better. The attention is caught by indirect instruction, and he that sat down only to reason, is on a sudden compelled to pray.”