Up until now, this parable has advocated gleaning true ideas from evil sources. This, the final verse of the parable, warns that we have to make sure we take only the ideas, and not the evil they inspire in others. Ultimately they have to fit in as part of knowledge from the Lord, not knowledge from the world.

A "servant" here represents exterior things – our actual actions. They are controlled by a "master," or a system of ideas.

There are two potential masters here. "God" represents truth from the Lord; "mammon" represents truth from other sources, without any connected desire for good. Ultimately, we can only use one to guide our external actions. If we choose to follow the Lord (by "loving the one") we will feel an aversion to ("hate") the jumble of disconnected ideas represented by mammon. If we decide to trust ourselves to figure what's good (being "loyal to one"), we will lose touch with real truth and see little value there ("despise the other).

So we might benefit from mammon in the short run, but God has to be the ultimate master.

(References: Apocalypse Explained 847 [3]; Arcana Coelestia 3875 [3], 9093 [2], 9210 [3]; True Christian Religion 437)

4500. And came upon the city boldly, and slew every male. That this signifies that they extirpated the truths of doctrine of the Church among the Ancients, is evident from the signification of a “city,” as being the doctrine of the church (n. 402, 2449, 2943, 3216, 4478), here of the Church among the Ancients, because this church is represented by Hamor and Shechem, whose city it was; from the signification of “boldly,” as being with assurance, here the assurance of what is false and evil; and from the signification of a “male,” as being truth (n. 749, 2046, 4005). Hence it is evident that by “they came upon the city boldly and slew every male” is signified that from the assurance of falsity and evil they extirpated the truths of doctrine of the Church among the Ancients. It was the Church among the Ancients (that came from the Most Ancient Church) which would have been set up with the posterity of Jacob, because the Ancient Church had begun to perish; but it is here described in the internal sense that they extinguished in themselves all the truth of faith and good of charity, thus all the internal of worship, and that therefore no church could be instituted with that posterity; from which it came to pass that because they stubbornly insisted, the mere representative of a church was instituted with them (see n. 4281, 4288-4290, 4293, 4307, 4314, 4316-4317, 4429, 4433, 4444).