1 - I remind you before I die to make your election on Christ sure by clinging to His promises and adding virtue to your faith. You have the sure Word of God to direct you.
2 - God has and will punish the wicked. Don't listen to false teachers who promise freedom, but enslave you.
3 - Scoffers say Jesus won't return, but God came in the flood of water and He will come again in fire, like a thief to destroy the earth. So we need to be holy as we wait for the new heavens and earth. Listen to what Paul says, even its hard to understand. False teachers distort what he says, like they do the rest of the Bible. Grow in the grace of Jesus Christ.