the second book of peter is very insightful we really spoke to me was actually in the first chapter starting in verse 5 talking about being virtues and basically making a list in order on what should come first in order to remain virtue in our faith to Christ.
in Jude although short it was straight to the point in this letter bring gratefulness of the friendship and sharing as well as warning against all the falsehood that has been happening he gets really detailed and tells them to remain faithful.