6578. And spake upon their heart. That this signifies trust, is evident from the signification of “speaking upon the heart,” as being to impart trust, namely, that evil should not befall; for “to speak” denotes influx (see n. 2951, 5481, 5797), and the “heart” denotes the will (n. 2930, 3888); thus “to speak upon the heart” denotes influx into the will, and the resulting trust. From all this it is also evident that there is a marriage of truth which is of the understanding, and of good which is of the will, in every detail of the Word; for “comforting” is said of the understanding, and “speaking upon the heart,” of the will; therefore also his “comforting them” signifies hope, for this is of the understanding by means of truth; and his “speaking upon their heart” signifies trust, for this is of the will by means of good, because genuine trust is impossible with any but those who are in the good of charity; and genuine hope with any but those who are in the good of faith.