In Jude 10 the Spirit is addressing those who had crept into the church and introduced perversions to the grace of God. The Spirit is warning that despite their seductive words, which tend to sound so right because they sound so “religious,” these people are led (and judged) by their instincts. As such, they are like wild or unreasoning animals. If they do not like or understand something, they will revile it or speak impiously about it (which is what it means to blaspheme). And they exercise their blasphemy and perversions from within the church—they may be those who themselves have a pulpit or a platform, or who have corrupted those with a pulpit or a platform.
