The Spirit of God acts in a very different manner in the one case, from what He doth in the other. He may indeed act upon the mind of a natural man, but He acts in the mind of a saint as an indwelling vital principle. He acts upon the mind of an unregenerate person as an extrinsic, occasional agent; for in acting upon them, He doth not unite Himself to them; for notwithstanding all His influences that they may be the subjects of, they are still sensual, having not the Spirit (Jude 19). But He unites Himself with the mind of a saint, takes him for his temple, actuates and influences him as a new supernatural principle of life and action. There is this difference, that the Spirit of God, in acting in the soul of a godly man, exerts and communicates Himself there in his own proper nature. Holiness is the proper nature of the spirit of God. The Holy Spirit operates in the minds of the godly, by uniting Himself to them, and living in them, and exerting His own nature in the exercise of their faculties. The Spirit of God may act upon a creature, and yet not in acting communicate Himself. The Spirit of God may act upon inanimate creatures; as, the Spirit moved upon the face of the waters, in the beginning of the creation; so the Spirit of God may act upon the minds of men many ways, and communicate Himself no more than when He acts upon an inanimate creature. For instance, He may excite thoughts in them, may assist their natural reason and understanding, or may assist other natural principles, and this without any union with the soul, but may act, as it were, as upon an external object. But as He acts in His holy influences and spiritual operations, He acts in a way of peculiar communication of Himself; so that the subject is thence denominated spiritual. This spiritual and divine light does not consist in any impression made upon the imagination. It is no impression upon the mind, as tho one saw anything with the bodily eyes: it is no imagination or idea of an outward light or glory or any beauty of form or countenance, or a visible luster or brightness of any object. The imagination may be strongly imprest with such things; but this is not spiritual light. Indeed, when the mind has a lively discovery of spiritual things, and is greatly affected by the power of divine light, it may, and probably very commonly doth, much affect the imagination; so that impressions of an outward beauty or brightness may accompany those spiritual discoveries. But spiritual light is not that impression upon the imagination, but an exceeding different thing from it. Natural men may have lively impressions on their imaginations; and we can not determine but the devil, who transforms himself into an angel of light, may cause imaginations of an outward beauty, or visible glory, and of sounds and speeches, and other such things; but these are things of a vastly inferior nature to spiritual light.