What does Exodus 8:18 mean?
Egyptian court magicians were able to duplicate prior miracles—or at least make it seem like they did (Exodus 7:11–12, 21–22; 8:7). During the last plague, it seems their success was limited (Exodus 8:8). Now, the sorcerers are at a loss. An all-pervading swarm of tiny insects has overtaken Egypt (Exodus 8:16–17). Whether the occultists' prior successes were tricks or supernatural acts by demons, they have no such luck now. They know, for certain, that this cannot be a trick. It cannot be done by the powers they have. This strikes against Egyptian belief in various insect- and marsh-related idols such as Wadjet.The conjurers will interpret this situation correctly: they will attribute the plague to divine power (Exodus 8:19). They might not have fully understood the God of Israel, but they could recognize true supernatural power. Pharaoh, however, will continue to ignore these proofs. What should have been another sign that he should release the Israelites (Exodus 1:11–14; 5:1–4) becomes more evidence of his insincerity.