10675. And I will enlarge thy border. That this signifies the multiplication and extension of truth from good, is evident from the signification of "enlarging the border," as being the multiplication and extension of truth from good (see n. 8063). That this is signified by "enlarging the border," is because insofar as evils and the falsities of evil are removed, so far the truths which are from good are multiplied, because nothing else than evils and the falsities of evil obstructs the influx of truths from the Lord and their multiplication with man; and therefore insofar as evils and falsities are removed, so far truths succeed in their place.
 This is the case with man's understanding, whether it consists of the truths which are from good, or of the falsities which are from evil. It cannot consist of both together, for they are opposites. And it is the understanding of man which receives truths, and is formed by means of truths; for whatever is in his understanding bears relation to truth. From this it is evident that insofar as the falsities from evil are removed, so far truths from good may be multiplied. This was represented by the driving out of the nations from the land of Canaan, for by the nations therein were represented evils and falsities (see at the places cited in n. 10057); and by the sons of Israel were represented goods and truths.
 It is said that it is man's understanding which receives truths and is formed by means of truths, because in the proper sense nothing can be called understanding but that which is from the truths which are from good. That which is from the falsities which are from evil is not understanding; because intelligence and wisdom cannot possibly be predicated of falsities from evil, seeing that falsities from evil completely destroy intelligence and wisdom, and bring in insanity and foolishness in their stead; and therefore man's understanding is never opened except when the man perceives and loves truths; and the perception and love of truth are from good. Consequently it is truths from good that are the source of the understanding.
 He who believes that any person is possessed of an understanding who is able to reason in a skilful manner against the truths of the church, is very much mistaken; for such a person sees nothing within himself, but only outside of himself. To see within one's self is from heaven; to see outside of one's self is from the world. And he who sees only from the world sees from a deceptive light, which light becomes mere thick darkness when light from heaven flows in upon it.