4044. Representations are nothing else than images of spiritual things manifested in natural ones, and when the former are accurately represented in the latter they correspond. But anyone who does not know what the spiritual dimension is but only what the natural is may imagine that such representations and consequent correspondences are not possible. For he might say to himself, How can that which is spiritual act on that which is material? But if he will reflect on the things taking place every moment within himself he will be able to gain some concept of them - that is to say, if he will reflect on how the will can act on the muscles of the body and produce actual movements; or on how thought can act on the organs of speech, by moving the lungs, windpipe, throat, tongue, and lips, and so produce speech; also on how affections can act on the face and there produce images of themselves, so much so that from these one person often knows what another thinks and wills. These actions are able to provide some idea of representations and correspondences. Now as such things are produced in man and not one continues to be produced there by itself but is effected by something else, and this is effected by something else again, which finally is effected by the First - all of which is achieved by means of a connected series of correspondences - those who enjoy some fair measure of judgement may deduce that there is a correspondence between the human being and heaven, and in addition between heaven and the Lord, who is the First.