Keeping
The called are kept in verse 1, rebellious beings are kept for judgment, believers keep themselves in God's love, and God is able to keep them from falling.
Received faith
The faith is delivered once for all and becomes the foundation on which the beloved build together.
Speech and desire
The intruders slander, grumble, boast, flatter, and follow desire; Michael's restraint and Spirit-shaped prayer provide the contrast.
Judgment and mercy
Jude speaks seriously about judgment while commanding mercy and rescue toward people endangered by the corrupting influence.
Traditional material
The Moses and Enoch traditions serve specific argumentative purposes without licensing a speculative angelology or settling the status of whole source collections.
Beloved
Repeated direct address turns the readers away from fascination with intruders and toward remembrance, formation, prayer, hope, and care.