Thus while he spake, each passion dimmed his face, Thrice changed with pale⁠—ire, envy, and despair; Which marred his borrowed visage, and betrayed Him counterfeit, if any eye beheld; For Heavenly minds from such distempers foul Are ever clear. Whereof he soon aware Each perturbation smoothed with outward calm, Artificer of fraud; and was the first That practised falsehood under saintly show, Deep malice to conceal, couched with revenge: Yet not enough had practised to deceive Uriel, once warned; whose eye pursued him down The way he went, and on the Assyrian mount Saw him disfigured, more than could befall Spirit of happy sort: his gestures fierce He marked and mad demeanour, then alone, As he supposed, all unobserved, unseen.