Thomas Aquinas

“ Yet this abstraction from the senses is sometimes complete, so that a man perceives nothing with his senses; and sometimes it is incomplete, so that he perceives something with his senses, yet does not fully discern the things he perceives outwardly from those he sees in imagination. ”

“ It is true that man is able by his natural powers to form all kinds of pictures in the imagination, by simply considering these pictures, but not so that they be directed to the representation of intelligible truths that surpass his intellect, since for this purpose he needs the assistance of a supernatural light.
Art. 3 - Whether the prophetic vision is always accompanied by abstraction from the senses? Objection 1: It would seem that the prophetic vision is always accompanied by abstraction from the senses. ”

“ As stated above, sometimes in prophetic revelation imaginary species previously derived from the senses are divinely coordinated so as to accord with the truth to be revealed, and then previous experience is operative in the production of the images, but not when they are impressed on the mind wholly from without.
Reply to Objection 2: Intellectual vision is not effected by means of bodily and individual images, but by an intelligible image. Hence Augustine says (De Trin. ix, 11) that "the soul possesses a certain likeness of the species known to it." ”

“ Accordingly, when a man knows that he is being moved by the Holy Ghost to think something, or signify something by word or deed, this belongs properly to prophecy; whereas when he is moved, without his knowing it, this is not perfect prophecy, but a prophetic instinct. Nevertheless it must be observed that since the prophet's mind is a defective instrument, as stated above, even true prophets know not all that the Holy Ghost means by the things they see, or speak, or even do. ”

“ Now things are represented to the human mind under the form of species: and according to the order of nature, they must be represented first to the senses, secondly to the imagination, thirdly to the passive intellect, and these are changed by the species derived from the phantasms, which change results from the enlightening action of the active intellect. ”