'Mammon' is an ancient word that means 'wealth' or 'riches,' and is used in the Bible in a negative way, denoting worldly wealth as opposed to spiritual wealth. 'Riches' in the Bible represent knowledge and understanding of spiritual things -- good things to have. But such knowledge is not restricted to good people; it's possible to know and understand a great deal about spiritual things and not use it, or to have it and use it toward selfish ends. This is the kind of behavior that 'mammon' describes.

2623. A son. That this signifies the Divine rational is evident from the signification of a “son.” In the internal sense of the Word a “son” signifies truth (n. 489, 491, 533); and as truth is the chief thing in the rational (n. 2072, 2189), the rational is also signified by a “son;” but here the Divine rational, in which principally there is good, which Isaac, who is the “son,” also represents (concerning which hereafter).