"We must remember that Satan has his miracles, too"

John Calvin's quote is a pointer that evil can be camouflaged as good. It is an alerting to be vigilant and to not be deceived by looks. He is warning us to be knowledgeable about the power of Satan and his ability to trick us. He is advising us that Satan can use his wonders to lead us astray and to be cautious not to be taken in by them. He is likewise advising us that we need to be on guard against the temptations of the devil and to not be fooled by his tricks. We need to bear in mind that Satan has his miracles, too, and that we should be aware of them and not be taken in by them. We should be wise and critical in order to acknowledge the distinction between good and evil.